^^^That makes total sense. Thinking of "god" as a abstract noun, like love or pain, where they really do only "exist" because they are produced inside people's brains. There is no evidence of love or pain free-floating around in outer space where there are no living beings. Likewise, there is no evidence of any god where there are not living beings to envision such a being.
Everyone has a different idea of what god is. What does a "greatest possible being" look like? An old but improbably muscular Euro-dude with a long white beard and a deep, echoing voice--British accent, of course. Why?
If we could hook everyone in the world who believes in a god to a computer screen that drew an image based on what each person thought god was like, we would get a whole lot of different pictures.
It would vary depending on age, culture, educational background. People from an isolated tribe on a remote island who have never seen the paintings from the Sistine Chapel would not have that image in their mind. They might see god as one of their carved idols, or an animal totem, or the shaman of their tribe.
We know this is true, because of the very different religious imagery produced by different cultures. The Hindu pantheon does not look like the Aztec pantheon, and neither looks like the west African pantheon or the ancient Greek pantheon. They are all different gods!
That is not what you should get if there was really one true god, a real being, that communicated with everyone. Everyone should be imagining that one god. You would expect there to be some consistency. But there is not, other than many cultures having gods of important things: war, love, rain, death and so forth.
There are also legends and myths that seem to be universal among human cultures--stories about families and disputes and mistakes and heroes and sacrifice. That is why, when Christianity is taught to people, there is often a local god who people can associate with Jesus or Jehovah, a powerful angry or loving and long-suffering father god-- like Zeus. Or the upstart reckless hero son god--like Krishna. But even there, the gods look and behave differently from culture to culture.
Same thing with love, or pain. Different cultures have different ways of visually expressing them. Not everyone thinks of love as red hearts or a fat baby with arrows. Because love is abstract. Not so much with concrete nouns like a cupcake, the Eiffel Tower, or Ronald Reagan, or the dining room chair.
God is a cow, or a serpent-bird, or the sun, or a giant man with a beard. Love is a pregnant woman or a heart-shaped glittery stone or a pink flower or a baby with arrows. Pain is red, sharp and angry; or yellow, hot and nauseating; or white, cold and metallic.
Nobody when asked to describe a cupcake or a chair would talk about serpent-birds or cows.