If you don’t believe in God, you believe the world is fundamentally matter and that life came about through the process of evolution. Evolution requires only the survival of the fittest, and survival simply comes about through 4 things: fighting, fleeing, feeding, and reproduction. That’s it. At no point along the way do your thoughts about the world around you actually have to truly represent the world around you.
For instance, an evolutionary psychologist might tell you that mild paranoia actually gives you better chances of survival than realism, so you may have evolved into a kind of paranoia that you now think is an accurate picture of reality. In other words, your thoughts about what is “true” and “real” simply aren’t, because you’re more likely to survive this way.
That means that when you say “I don’t believe in God,” you are saying that you can’t trust your thoughts to actually reveal reality. You don’t trust your own thoughts to be true. As a consequence, your perception that there is no God can’t be trusted to be true, and thus you don’t believe in your own atheism.
If this seems silly on first glance, you might want to give it a second thought.
Philosophers of all stripes are coming to see that scientific methodology can fundamentally undermine itself.
These are the kinds of things I speculate about in