You speak of guarantees and proof as if we have to have everything nailed down 100% now or we have no basis for belief. Wherein is faith in that? Without faith, it is impossible to please God. My faith is in God. I believe that He will do and has done what He said He would do. He promised to guide me into all truth. I will not make Him into a liar and neither should you. Either He told the truth when He said the Holy Spirit would guide us or He lied. I choose the former. With the way some on this thread kick against ANY KIND of scriptural interpretation that hasn't been spelled out by a priest or patriarch, one wonders if everyone proclaiming themselves to be Christians feels ths same.
2 Timothy 2
15Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.
# 2 Timothy 3:15
And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.
2 Timothy 3:16
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
God does not shun human agency in spreading His gospel. But that human agency MUST be 100% lined up with God's Word or else it is not speaking from Him. Doesn't mean that humans don't sometimes blow it. But those who are led by the Spirit of God will not get any essential wrong.
Ephesians 6:16-18 (King James Version)
King James Version (KJV)
Public Domain
[A Public Domain Bible] [KJV at Zondervan] [Zondervan]
16Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.
17And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
18Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints
If you go into the world without the Word of God at your side and in your heart, you are going as an unarmed man to battle. When times of trouble come, you will be destroyed.
What makes you see yourself as the final and infallible interpreter of the Scripture? Why should I choose your personal interpretation over the wisdom and Apoastolic succession of 2,000 years of unbroken Church teaching?
If you want a personal religion, that is your prerogative. Start your own "church" if you want. But don't confuse it with what has been Christianity for two millennia.