(and, yes, I know, there was no year 0 and Jesus was born, if at all, in 6 AD, one of my favorite paradoxes).
6 AD? The dates I have heared are all earlier than that, usually between 7 BC and 4 BC. And I don't see why you would doubt that Jesus was born - either you believe in the Bible which says he did, or you do not believe that a miracle is involved, and then you'll have to accept that since he has lived, he must have been born.
Andre Engels