[Nathans_Dad]

I think you might be confusing the concept of the virgin birth and the concept of immaculate conception. They are different.

The gospels of Matthew and Luke both talk about Mary being a virgin when she conceived. Those gospels are a tad bit older than a few hundred years.

Now immaculate conception is a Catholic dogma that says that Mary was shielded by God from original sin until she gave birth to Jesus. That's more of a Catholic only thing and may have been originated a few hundred years ago.