>> the story of that birth is found only in two gospels, luke and matthew. and while they don't agree on all the details, they do agree that this event was miraculous -- a child born to a virgin. >> this is a tradition in antiquity, in general. if you're important, you had a special birth. alexander the great had a virgin birth. his mother was impregnated by a god. it's what you do, okay? and so, certainly, that emphasis on jesus' special birth, the wise men, the angels, all of it, you know, have to do with showing that this is somebody you can expect great things of. and, of course, precisely, that's what happens. >> believers in jesus took that from the prophecy they found in isaiah, where they read the saying, "behold, a virgin shall conceive and bear a son, and call his name jesus." and some of them must have read that and said, aha! that's what it was. his birth was a miracle.