Note: People identity God with their moral system. People keep having different systems. Some even keep changing their core moral ideas. The God word over-simplifies and gives a false impression of agreement.
Premise 1: The fundamental question of existence is a binary choice between theism, the existence of at least one deity, and atheism, the non-existence of all deities.
Premise 2: If theism is correct, the probability of any single, specific version of a deity being the true one is divided among the thousands of proposed deities in human history.
Premise 3: Because the baseline division between theism and atheism is framed as a binary choice, atheism is assigned a fixed 50% probability of being correct.
Conclusion: Therefore, because a 50% probability of no deity existing is
vastly higher than the fractional probability of any specific deity existing,
betting on atheism is the mathematically superior choice.