And if it is useful, works to make us feel and be more whole, more abundantly alive, how is that not a real thing? God is because God works. As you say, faith in God is useful, so God functions in our lives in a very real way. That doesn’t tell us the details of the reality, just its effects. Separate Being or Function? If “God” is really our potential for wholeness, aided by endorphins or prefrontal cortex’s, that still is real and certainly worth praying to, accessing, using in our real lives. God is because God works.