However, there's nothing outside of man made traditions that claims she remained a virgin after his birth.
Some seem to believe that Jesus' devinity is tied to Mary's virginity.
If this were true, would He really be God?
I think it is 2 things.. 1st Perhaps they Think jesus had to be raised in a petri dish.. only a perfect womb, a perfect breast, perfect milk, perfect mother could raise Christ ..forgetting that Jesus came to live in this fallen world, to live with sinners and die at their hands..
Plus I think it a combination of the leaders of Roman and most catholics being essenes.. the body is sinful, sex is sinful and the issue most of us have thinking of our mom and dad having sex.. it just "feels" unseemly
But the real question to me is , as you note, that the divinity of Jesus is somehow tied to Mary, which is why they become so unhinged
Again, I expected better research from you. The divinity is not tied to the v. Nowhere do you read that in statements of dogma or doctrine — how do you jump to that conclusion?
And her alleged sinlessness, and the same question remains.