If you look only as Genesis as an allegory, you have a major...

If you look only as Genesis as an allegory, you have a major problem, because if it's an allegory, then tell me who our ancestor was? If Abraham was real, then from Abraham if Adam isn't real, if it's just an allegory, it's just a story, then what's the real Adam who really fell in a garden and really sinned? Where did we come from?