Of course in the hierarchy of Truth, the doctrine of perpetual virginity is much lower to the teachings of Christ, His salvation, message, nature etc. those are the central core of doctrine that elucidates the Salvation given to us who accept it from Christ
however, if the early Christians believed it, on what basis do we denounce them?
This habit of changing what we have always believed is the truth leads to nothing but the errors that we see amongst our non-Catholic brethern
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To the sola-solo types scripture is silent one way or the other -- it is not expected to record every little thing, for example, Jesus is called the carpenter's son in Matthew 13 and Mark 6, but not after -- yet he was still the carpenter's son.
Not a single person was saved until Martin Luther came along. Even the guys that put the Bible together are now burning in hell because they belonged to the Church (talk about your irony overload!) Think of all those Church members burning in hell. Every single one of them. If that's not proof the god of the Protestant cults is pure evil, I don't know what is.