Exactly this thought was my first step into agnosticism. God is irrelevant. People who are just behaving in a good way out of fear of being disciplined at the end of times (and not out of their free will) are bad people.

Many years later I arrived at atheism (with the single caveat that I can't scientifically disprove god, but if it exists it is irrelevant for my life).

I choose to be a non asshole by following my own moral compass.