Nearly every human group has created something in the way of a religion, no two of which are the same. When something is based on reality, like mathematics or scientific medicine, groups of people independently arrive at the same answers. The claimed characteristics of the supernatural reflect the extremely natural characteristics of the believing group. Kingdoms on earth dream up kingdoms in heaven. Cruel people have cruel gods.
Slavers have gods that favor slavery, oppressed people have gods that comfort the oppressed.
Even within groups of supposedly similar believers, there are major disagreements. A knowledge of human psychology reveals a strong tendency to wishful thinking, delusion, susceptibility to tradition and to conformity with societal norms. These easily account for the common assent to religious creeds, even in the absence of a shred of evidence. As a practical matter, we note that the kind of things that religious people offer as evidence for their brand of religion, they do not accept as evidence when proferred by adherents of other religions. In the absence of any convincing reason to accept one set of claims while rejecting the rest, the simplest conclusion is that they are all nonsense, and all based on the same human error.