You're right that people do create God in their own image. It's called idolatry. Do you have something against idolatry?
By your standards it is irrational to look for regularities in the universe that all people who look can see, but rational to trust personal revelations that divide people, and lead to wars and schisms.
What do you have against personal revelations that divide people and lead to wars and schisms?
Cordially,
Nothing actually. Wars are a fine method of population management. Far fewer theological implications than condoms or pills.