Logic tells you that God has to reveal himself to man in order for man to know God exists or know anything about God. It happens to be the Christian perspective too.
Logic? History of religions shows to me that humans have come up with explanations of many things. A very common explanatory device for events both large scale like volcanic eruptions or very personal like illness or recoving from an illness was that some unseen or barely scene spirit or spirits were responsible. The surmises about these spirits can get very complex as do the experiences of them.
That these experiences are functions of the human nervous system and thus the creation of the human brain is what seems logical to me.
Decades ago I was struck by something B.F. Skinner wrote about dreaming. I'll have to paraphrase. He said something like this: It took primitive man a long to time to realize that when he dreamed about a wolf no wolf was present. It's taken a long time since to realize that not even a representation of a wolf is present. He was saying that dreaming involved the behaviour of seeing a wolf, no representation of a wolf is stored in the brain in the way that a photo album stores photographs.
There doesn't have to be a god in order for people to believe or experience a God. There were, perhaps still are, people in England, Ireland, and elsewhere who claim to believe and even have seen fairies and little people. Would you claim that logic tells you that fairies and little people have to reveal themselves to man in order for man to know fairies and little people exist or know anything about fairies and little people?
lfen