I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours

This is a quote that I see thrown around a lot in atheist circles and it sounds reasonable until you try some word substitution:

I contend we both believe 9/11 didn’t happen. I just believe in one fewer cause than you. When you understand why you dismiss all the 9/11 conspiracy theories, you will understand why I dismiss Arabs flying planes into the buildings

I content we both believe Shakespeare didn’t exist. I just believe in one fewer identity than you. When you understand why you dismiss the theory that Shakespeare was Francis Bacon, you will understand why I dismiss Shakespeare being William Shakespeare.

When you dismiss other Gods, you are claiming that those Gods are not adequate explanations for your religious experience, Thor and Mohammed and Thetans are not the reason why your prayers get answered. When you dismiss all Gods, you are claiming that there is no religious experience to require explanations for, the illusion that your prayers are answered are caused by a trick of the brain. Believing in zero Gods is categorically different from believing in a God and atheists should stop pretending otherwise.