Virgin birth is a feature common to a wide range of religious traditions practiced by ancient cultures which flourished for over a thousand years before this one.
Can you, or would you, dispute or deny that other historical figures such as the Babylonian god Ea whose son Marduk was born to Damkina is anything less than an account of an historical, factual event? Can you prove otherwise?
How about Zoroaster whose mother Dughdova conceived him by a shaft of light?
What of the ancient Egyptian pharaoh Hatshepsut, whose "divine birth" colonnade at Deir-el-Bahri depicts unequivocally the story which in later times was recorded as the nativity story by Luke and Matthew?
So many to choose from ... all they all true? All made up? Or just the ones you don't want to believe in?
One to ponder.