[RaceBannon]

no, Mary gave birth to several children according to the Bible

Mt 1:25 And knew her not till she had brought forth her firstborn son: and he called his name JESUS.

Firstborn, meaning more than one

Mt 12:46 While he yet talked to the people, behold, [his] mother and his brethren stood without, desiring to speak with him.
Mt 12:47 Then one said unto him, Behold, thy mother and thy brethren stand without, desiring to speak with thee.
Mt 12:48 But he answered and said unto him that told him, Who is my mother? and who are my brethren?
Mt 12:49 And he stretched forth his hand toward his disciples, and said, Behold my mother and my brethren!
Mt 12:50 For who soever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother.

Here, Jesus rebuked the crowd, plainly saying that even though his siblings were present, that those who believed on Him were brothers, also, not just blood relations

The Apostle James is called the Lord’s Brother, family, blood brother
Gal 1:18 Then after three years I went up to Jerusalem to see Peter, and abode with him fifteen days.
Gal 1:19 But other of the apostles saw I none, save James the Lord’s brother.

[Boogieman]

“Mt 1:25 And knew her not till she had brought forth her firstborn son: and he called his name JESUS.”

It’s also worth noting the “till” in that sentence. This usage plainly states that after she bore Jesus, Joseph did “know” her. If the word “before” had been used, we couldn’t make that conclusion, but with “till”, there is no other way to read it.

[Mark17]

no, Mary gave birth to several children according to the Bible

You are correct sir. Two of Mary and Joseph's natural children, James and Jude, conceived through, dare I say it? Normal human reproduction, otherwise known as sex. Both wrote books in the New Testsment, called, of all things, James and Jude. James, being the leader of the Jerusalem Church, not Peter.

[paladinan]

no, Mary gave birth to several children according to the Bible

The Bible says nothing of the sort, and suggestions to the contrary are mere Protestant "projection" (a.k.a. "eisegesis"). See below.

Mt 1:25 And knew her not till she had brought forth her firstborn son: and he called his name JESUS. Firstborn, meaning more than one.

Nonsense. "Firstborn" is true of any oldest child of a mother; even an only child is "firstborn"; the term used in the Bible refers to "the child which opens the womb". Have some sense, here: the Law required that every firstborn male be consecrated to the Lord (cf. Luke 2:23, etc.) on the fortieth day after birth... but would anyone seriously suggest that the woman would have to have another child in the interim (that would be an impressively brief gestation period!), so that the original child could properly be called "firstborn"? No... the first child is the first child, even if no others come afterward, and even if the mother dies in childbirth.

Mt 12:46 While he yet talked to the people, behold, [his] mother and his brethren stood without, desiring to speak with him.

"Brethren" (Gk: "adelphos") was a rendering of the Aramaic word for "kin"--which could mean anything from "blood-sibling" (cf. Matthew 4:21, etc.) to "fellow Israelite" (cf. Phillipians 4:8, etc.) No one can simply (and carelessly) "run away" with the English word "brother", and immediately conclude, "Ah! Blood siblings, and fellow biological children of Mary!" Ditto, for Matthew 12.

Here, Jesus rebuked the crowd,

That's a mere projection; there's no reason at all to consider this a "rebuke". It's a clarification, and a teaching, certainly... but there's no reason to suppose that Jesus was being severe, here.

plainly saying that even though his siblings were present,

The word "siblings" is nowhere in the text.

that those who believed on Him were brothers, also, not just blood relations

There's no difficulty with "blood relations" (since cousins would be that); but you're arguing that Mary had other children... and there's no proof in the text for that idea, at all.

The Apostle James is called the Lord’s Brother, family, blood brother

The Apostle James (the less--as opposed to James, the son of Zebedee, who was already martyred by the time the events in Galatians 2, etc., were recounted) was the son of Mary, mother of this James and of Joses (cf. Matthew 27:56)... not the Blessed Virgin Mary. It's another Mary altogether, albeit apparently a blood relative.