We have a problem with the question about if we believe there is a god. In the US that assumes the Christian definition of God, and for me and Jews, those stories are just stories to make a point. They are not to be taken literally. Actually, at least five of the stories appear to be are translations of Sumerian stories adjusted to fit the theme of one god and this leads some to think these people began in Egypt under a pharaoh who insisted everyone worship one god.
When I was 8, I asked my Sunday School teacher why Catholics and Protestants were separate. She could not give me a satisfactory answer and that lead to learning of all religions and they are all basically the same. Actually, I like the Hindu explanation of why we are not perfect better than the Christian one and I don't see their caste system as different from Western classes, in the days of old, when a person's life was stuck in the position a person was born into and this was seen as God's will.
Joseph Campbell explained how around the world myths share much in common. His notion was God spoke to everyone, and people heard him differently depending on their environment and history. I like that notion, but for me, that is not a god like the Christian god, but is logos. I think the Christian notion of a God that is modeled after humans, is as real as Zeus. Christians have made an incomprehensible god comprehensible and I think that is a mistake.
I say all that because I think we are better off accepting a notion of universal god than when we deny such a possibility, so I ask Christians to allow me and others, their understanding of god and don't make it an either-or choice.