It is one of billions that make up humanity. Humanity more or less classes the brain as a computer, and lots of these computers independently and through a myriad of experiences called life come to the conclusion that there is a God.
This is what is known as the fallacy "appeal to popularity". Just because something is supported by large numbers of folks does not make it so.
"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs