It has been done , the only physical existence of god proven is in the brain. God is a condition of the brain. So is it an entity?<quoted text>
In order to determine whether an object exists or not, the properties of that object have to be clear enough to allow some sort of judgment based on the evidence.
When it comes to the question of gods, there is little to no agreement about the properties, so no determination of existence can be possible and the question is, strictly speaking, meaningless.
It make absolutely no sense to say that something exists when there no possible way of testing its existence?
Have you defined a set of testable properties for a deity yet?
Doubtful , but there's no doubt it exists in abstract.
But far from omnipotent and has a very limited existence.
God is imprisoned in the minds of those who believe.
Hard to say if that is "real" but it is for them.
Some would call it a brain disorder , I will call it a condition of the mind.