Because mythologies do not constitute evidence. Does Isis exist just because Egyptian holy books say so?
Your insistence that the Bible is “mythology” shows that you are incapable of reason, as you do not have sufficient knowledge of that which you are criticizing.
Come back when you “investigate, study, learn”, then we’ll listen to the “opinion” that you offer.
“I choose to believe the Bible because it is a reliable collection of historical documents written down by eyewitnesses during the lifetime of other eyewitnesses that report supernatural events which took place in fulfillment of specific prophesies and claim to be divine rather than human in origin.”