As far as I know, in 1854 the Immaculate Conception of Mary was proclaimed, and in 1950 the Assumption of Mary was proclaimed, everything else of significance was known far earlier. This includes the perpetual virginity of Mary and the Immaculate Conception of Christ, both of which have been known since Creedal times.
If you can point to a verse in the bible that refers to Mary as perpetually a virgin, I will accept it. Unfortunately you can not because it doesn’t exist. for some reason, around the 4th century, Church leaders started to rebel against the mother of Jesus having sex with her husband.
It could be because God himself forbid adultery. It could be that Joseph was a Jew. There is no sin in sex with your husband.
So, Mary became “Queen of Heaven” and a perpetual virgin 400 years after the crucifixion. She was exempted from original sin in 1854, and she was granted assumption into heaven in 1950. Where is this in the Bible?
Why are you so sure that the Mormons can’t be right, when your religion has changed so much without Biblical evidence?
There is no way you can convince me from the Scriptures that after the proper amount of time after Jesus' birth, that Joseph and Mary did NOT get it on.