I believe history would be that evidence. Since Asura-Mazda to the present day, almost all societies have believed in a god of some form. Whether that god exists or not is functionally irrelevant. The fact that humans seem to base their societies on an external power does seem significant to me. Where you follow Asura-Mazda, YHWY, Jehova, Allah, Baha, or any other God seems to work for us, until we run into some sort of other belief system, but the basics are all the same. We need to focus on our similarities, instead of our differences. All people have the same basic goals and ideals. We've all been working for hundreds of thousands of years to make it so our children will all have a good life.