I feel I have more than enough evidence to reasonably conclude all deities are fabrications of human psychology. Here are some examples.
Lack of continuity. We've been around for about 200,000 years, operating with the same basic biological equipment, but none of our modern deities were believed in prior to the last few thousand years. Our distant ancestors had their own, many of whom are long forgotten.
Lack of cohesion. I often say there are more "gods" than believers. Many gods are no longer believed in and many believers lay claim to more than one. Also, among communities that claim to believe in only one, every believer gives a radically different description of him when pressed for details. This is not a pattern we would expect to see if the object of belief actually existed. Ask anyone on earth to describe an elephant and you basically get an elephant. Ask them to describe their god/s and it could quite literally be anything at all.
Geographic distribution. Like pockets of evolution, God concepts predictably cluster in "islands" and spread only along human migration routes. We have never seen the exact same god story crop up in two geographically isolated human populations who have no contact with one another. This is insurmountable evidence that belief is passed from human to human rather than by direct revelation from god/s.
Absence of positive evidence. Like everything we've dreamed up that doesn't exist - sea monsters, unicorns, leprechauns, fairies, Santa Claus, big foot, alien lizard people, etc. - Not one scrap of evidence has ever been produced that could be interpreted to affirm the existence of God/s unless you count things like seeing a bearded face on your toast, which I don't.
Positive evidence that claims of God's accomplishments are untrue. Studies have found, for example, that intercessionary prayer has no effect on medical outcomes. I don't want to get too narrow here in my definition of gods, but that outcome persists no matter what religious or supernatural claim we attempt to investigate. We're not talking "inconclusive" here, we're talking "falsified". The only exception I'm aware of is that meditation truly does change your brain chemistry, so the Buddhists are onto something. But I digress, since that has nothing to do with gods.
Human stupidity. Despite our narcissism vis a vis our unusually large mammalian prefrontal lobe, humans throughout history have been wrong about nearly everything nearly all of the time. If our only evidence for the existence of gods is the testimony of other humans, I don't find it even the slightest bit persuasive. In fact, I'm inclined to assume it's nonsense, and am rarely disappointed.
I think that about covers my thoughts on the subject.