Umm, well actually, plenty of Christians DON'T believe Jesus was an only child, although I do.
I assume I can't convicne you of the fact that Jesus is the Son of God by quoting the Bible, since you obviously wouldn't accept it as inspired. But, all but the most prejudiced of secular scholars accept the Gospels as historically valid, if not necessarily doctrinally correct. But if Jesus lived, said and did all the things that are in the Gospels, I would find it hard to believe He was NOT the Son of God, although obviously one must have some Faith.
It certainly is not "factually impossible". If there is a God, then certainly Jesus could rise from the dead. Although, obviously, if you are not going to believe it, you jsut are not going to believe it.
I do hope you change your mind though.
Titans baby, Titans.