The only way anything exists is as physical matter (atoms and molecules) bound together with photoelectric energy. If God did actually exist, He would have to be made of the same suite of 92 chemical elements as everything else which is objectively real. If that were the case, God would be as easy to see as anything else that is part of the physical universe. The thing is, no such evidence of God's objective existence has ever been discovered, so it's reasonable to conclude Aristotle and the Catholics were wrong about the nature of reality. ...that physical matter is the actual basis of objective reality and that mental experiences are unreal mental abstractions, formed within a person's mind by their own living brain.
It's been 376 years since humanity learned the truth about how reality and perception actually work, and these days, only Christians and children at play still pretend their thoughts and perceptions are objectively real.