The Abrahamic religions do not have a monopoly on the concept of God. The irrationality of their particular fables, talking snakes and walking on water and all the behavioral quirks they claim God has expressed, has nothing to do with the concept itself.
Let’s say I popularized the idea that electricity is really just tiny pixies dancing around, and I came up with all manner of personality traits and stories to go along with them. Let’s say millions, billions of people embraced my pixie theory, and it mutated over time into schismatic alternatives with their own traits and stories. Do the ridiculous things now ascribed to electricity, so pervasively that most people picture little pixies when they hear the words, prove that electricity doesn’t exist?