One of the two Christian creation stories says that the first woman was made from the rib of Adam, the first man. Then that woman, Eve, would go on to give birth to children. If this is your belief system then that means you, unless you are somehow the Adam of that creation story, came from a vagina.
I can't decide what my favorite part of this is. God being Dean's father-in-law? Satan his brother-in-law? The fact that that conversation could totally make for a plausible episode? Naw, let's be honest, it's the "when."