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They converted to Roman Catholicism.

They traded one false belief system for another.

There is a difference between Roman Catholicism and Christianity.

Below is from Gotquestions.org

Question: "Who is the Lady of Guadalupe? Were the apparitions of Mary at Guadalupe real?"

Answer: In Catholicism, Our Lady of Guadalupe is the patron saint of Mexico, pictured as a woman in a blue mantle. Her hands are folded, her eyes are cast downward, and she is surrounded by a radiant glow. She is standing on a crescent moon supported by an angel underneath. This image is based on a series of five supposed appearances of the Virgin Mary in Mexico in the sixteenth century.

There are many different accounts of the Lady of Guadalupe, but what follows are the aspects of the story that appear most consistently. On December 9, 1531, a man named Juan Diego, an Aztec convert to Catholicism, was walking on Tepeyac Hill near Mexico City when he saw an apparition. Before him was a young Aztec girl. In the native Nahuatl language, the girl requested that a church be built on that hill in her honor. According to Diego, the girl was the Virgin Mary. When Diego told his story to the archbishop of Mexico City, Diego was instructed to return to the hill and ask for a sign to prove that she was indeed the Blessed Virgin.

When Diego returned to the place, the same girl appeared again and instructed him to gather flowers from the hill. The hill was normally barren, but at this time Diego found Castilian roses, which are not native to Mexico. The girl took the roses and placed them in Juan Diego’s cloak. When Diego returned to the archbishop and opened his cloak, the flowers fell to the ground. To their amazement, the inside of the cloak bore an image of the girl. Diego claimed he was visited by the girl three more times. She is now known as the Virgin of Guadalupe. The image imprinted in Diego’s cloak is on display now in the Basilica of Our Lady of Guadalupe in Mexico City.

The veneration of Our Lady of Guadalupe is widespread. Various popes since 1531 have declared her the patroness of not only Mexico but of all Latin America and then of all the Americas. Every year millions of faithful Catholics visit the basilica in Guadalupe to view her image enshrined there. Her feast is on December 12.

The apparitions seen by Diego have been questioned many times throughout history because of the lack of any documentation of the event prior to 1648. Critics also point out that the archbishop who spoke with Juan Diego failed to mention the accounts in his writings.

Catholic tradition relays many accounts of Mary, angels, or saints appearing to people. It is possible that some of these people did in fact witness supernatural events. It is the true source of these visions that is in question.

It is important to note that just because an apparition is authentic does not mean it brings a message from God. Having a genuine spiritual encounter does not mean the entity encountered was actually Mary, an angel, or a saint. Demons are called “lying spirits” (1 Kings 22:23), and one thing they do well is lie. Second Corinthians 11:14–15 says, “Satan himself masquerades as an angel of light. It is not surprising, then, if his servants also masquerade as servants of righteousness.” A possible explanation for apparitions of Mary, such as the young woman Juan Diego saw, is satanic deception.

We also know that a genuine message from God would not contradict the Word of God. Did the Lady of Guadalupe say anything that was inconsistent with the Bible? We have no exact quotes. However, one thing is sure—the Lady of Guadalupe asked for a church to be built in her honor.

Here is our evaluation of the apparition:

• Juan Diego said that the young girl looked as if she was of Aztec descent. Mary was Jewish, from the line of David.

• Many accounts claim that the girl said, “I am the ever-virgin Mary, Mother of the true God.” Catholics believe Mary to have an exalted place in heaven, with the most direct access to Jesus and God the Father. They also believe Mary was a perpetual virgin. Such a concept is nowhere taught in Scripture. Also, the Bible never calls Mary the “mother of God.”

• The young girl that Diego saw asked for a shrine to be built in her honor. The biblical Mary would never ask for anything to be done in her honor. Rather, she would instruct people to honor and worship God (see Luke 1:46).

• In some accounts of the story, the lady says she would answer prayer. This is also unbiblical. God alone answers prayer.

Did something supernatural occur on Tepeyac Hill and witnessed by Juan Diego? Yes, probably. Did Mary actually appear to him? No. Was the message from God? Based on its disagreements with the Word of God, no.

https://www.gotquestions.org/Lady-of-Guadalupe.html

The Fifteen Promises of the Rosary compared to the Word of God.

The astute reader will note the contradictions of the claims of the apparition claiming to be Mary with the Word.

15 Promises of the Rosary	Comparison to the New Testament
1) Whoever shall faithfully serve Me by the recitation of the Rosary, shall receive signal graces..	4“You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. 5“You shall not worship them or serve them ; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me, 6but showing lovingkindness to thousands, to those who love Me and keep My commandments. Ex 20¨4-6 NASB
2. I promise My special protection and the greatest graces to all who shall recite the Rosary.	11“I am the good shepherd; the good shepherd lays down His life for the sheep. 12“He who is a hired hand, and not a shepherd, who is not the owner of the sheep, sees the wolf coming, and leaves the sheep and flees, and the wolf snatches them and scatters them. 13“He flees because he is a hired hand and is not concerned about the sheep. 14“I am the good shepherd, and I know My own and My own know Me, 15even as the Father knows Me and I know the Father; and I lay down My life for the sheep. 16“I have other sheep, which are not of this fold; I must bring them also, and they will hear My voice; and they will become one flock with one shepherd. 17“For this reason the Father loves Me, because I lay down My life so that I may take it again. 18“No one has taken it away from Me, but I lay it down on My own initiative. I have authority to lay it down, and I have authority to take it up again. This commandment I received from My Father.” John 10:11-18 NASB
3) The Rosary shall be a very powerful armor against hell; it will destroy vice, deliver from sin, and dispel heresy..	10Finally, be strong in the Lord and in the strength of His might. 11Put on the full armor of God, so that you will be able to stand firm against the schemes of the devil. 12For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places. 13Therefore, take up the full armor of God, so that you will be able to resist in the evil day, and having done everything, to stand firm. 14Stand firm therefore, HAVING GIRDED YOUR LOINS WITH TRUTH, and HAVING PUT ON THE BREASTPLATE OF RIGHTEOUSNESS, 15and having shod YOUR FEET WITH THE PREPARATION OF THE GOSPEL OF PEACE; 16in addition to all, taking up the shield of faith with which you will be able to extinguish all the flaming arrows of the evil one. 17And take THE HELMET OF SALVATION, and the sword of the Spirit, which is the word of God. Ephesians 6:10-17 NASB
4. It will cause virtue and good works to flourish; it will obtain for souls the abundant mercy of God; it will withdraw the hearts of men from the love of the world and its vanities, and will lift them to the desire of eternal things. Oh, that souls would sanctify themselves by this means.	8For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; 9not as a result of works, so that no one may boast. 10For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them. Ephesians 2:8-10 NASB
5) Those who trust themselves to me through the Rosary, shall not perish.	16“For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life . 17“For God did not send the Son into the world to judge the world, but that the world might be saved through Him. 18“He who believes in Him is not judged; he who does not believe has been judged already, because he has not believed in the name of the only begotten Son of God. John 3:16-18 NASB
6. Whoever shall recite the Rosary devoutly, applying himself to the consideration of its sacred mysteries, shall never be conquered by misfortune. God will not chastise him in His justice, he shall not perish by an unprovided death; if he be just he shall remain in the grace of God, and become worthy of eternal life.	7“And when you are praying, do not use meaningless repetition as the Gentiles do, for they suppose that they will be heard for their many words. 8“So do not be like them; for your Father knows what you need before you ask Him. 9“Pray, then, in this way: ‘Our Father who is in heaven, Hallowed be Your name. 10‘Your kingdom come. Your will be done, On earth as it is in heaven. 11‘Give us this day our daily bread. 12‘And forgive us our debts, as we also have forgiven our debtors. 13‘And do not lead us into temptation, but deliver us from evil. [For Yours is the kingdom and the power and the glory forever. Amen.’] 14“For if you forgive others for their transgressions, your heavenly Father will also forgive you. 15“But if you do not forgive others, then your Father will not forgive your transgressions. Matthew 6:7-14 NASB
7. Whoever shall have a true devotion for the Rosary shall not die without the Sacraments of the Church.	16All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; 17so that the man of God may be adequate, equipped for every good work. 2 Timothy 3:16-17 NASB
8. Those who are faithful in reciting the Rosary shall have during their life and at their death the light of God and the plenitude of His graces; at the moment of death they shall participate in the merits of the saints in paradise.	37But in all these things we overwhelmingly conquer through Him who loved us. 38For I am convinced that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, 39nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord. Romans 8:37-39 NASB
9) I shall deliver very promptly from purgatory the souls devoted to my Rosary..	27And inasmuch as it is appointed for men to die once and after this comes judgment, 28so Christ also, having been offered once to bear the sins of many, will appear a second time for salvation without reference to sin, to those who eagerly await Him. Hebrews 9:27-28
10. The faithful children of the Rosary shall merit a high degree of glory in Heaven.	28And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose. 29For those whom He foreknew, He also predestined to become conformed to the image of His Son, so that He would be the firstborn among many brethren; 30and these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified. Romans 8:28-30 NASB
11) What you ask through my Rosary, you shall obtain.	14This is the confidence which we have before Him, that, if we ask anything according to His will, He hears us. 15And if we know that He hears us in whatever we ask, we know that we have the requests which we have asked from Him. 1 John 5:14-15 NASB 6Be anxious for nothing, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. 7And the peace of God, which surpasses all comprehension, will guard your hearts and your minds in Christ Jesus. Philippians 4:6-7 NASB
12. All those who propagate the holy Rosary shall be aided by Me in their necessities.	6Therefore humble yourselves under the mighty hand of God, that He may exalt you at the proper time, 7casting all your anxiety on Him, because He cares for you. 8Be of sober spirit, be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking someone to devour. 9But resist him, firm in your faith, knowing that the same experiences of suffering are being accomplished by your brethren who are in the world. 10After you have suffered for a little while, the God of all grace, who called you to His eternal glory in Christ, will Himself perfect, confirm, strengthen and establish you. 11To Him be dominion forever and ever. Amen. 1 Peter 5: 6-11NASB
13. I have obtained from My Divine Son, that all the advocates of the Rosary shall have for intercessors, the entire celestial court during their life and at the hour of death.	26In the same way the Spirit also helps our weakness; for we do not know how to pray as we should, but the Spirit Himself intercedes for us with groanings too deep for words; 27and He who searches the hearts knows what the mind of the Spirit is, because He intercedes for the saints according to the will of God. Romans 8:26-27 NASB
14. All who recite the Rosary are My sons, and brothers of My only son Jesus Christ.	14For all who are being led by the Spirit of God, these are sons of God. 15For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, “Abba! Father!” 16The Spirit Himself testifies with our spirit that we are children of God, 17and if children, heirs also, heirs of God and fellow heirs with Christ, if indeed we suffer with Him so that we may also be glorified with Him. Romans 8:14-17 NASB
15. Devotion to My Rosary is a great sign of predestination.	29For those whom He foreknew, He also predestined to become conformed to the image of His Son, so that He would be the firstborn among many brethren; 30and these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified. Romans 8:29-30 NASB

Bible quotes from NASB

RCC position on Mary from https://www.ewtn.com/faith/teachings/marya4.htm