I do think a lot of theists can’t wrap their minds around the idea that atheists don’t believe in God. It’s partly why I am sure to call myself an atheist and not an agnostic, because using agnostic defnitely gives thests the fuel to believe I must sometimes consider God in my life.
I recently saw a show on atheists. It was an hour long show trying to explain how atheists think. I was pretty disappoiinted that the majority of the show was people who had left religion, or atheists who preached their atheism like the very religious people do. Literally, some of them were preachers of atheism holding services about it or going to college campuses and talking to students about it.
One man was a Christian Minister who felt badly that he had become an atheist many years ago, because he was basically lying to his congregration, but he still worked as a Minister, because that is his vocation. He partcipates in a website that gives atheist clergy an outlet.
I had hoped the show would be full of people who were raised atheists and are atheists and how life is for us. I was barely aware of God at all growing up. He was mentioned in books at holidays and I heard other people talk about God sometimes. I saw the movie Oh God with George Burns as a kid, it was very funny and cute. I ready Dear God It’s Me Margaret in my tweens. None of it registered with me that there really was a God, or that so much of the world believed in God.
Anyway, back to your Q, I just think that if you feel God is in everything you see and do, it’s incomprehensible to those people that atheists can even move out of bed without believing. For them it would be like all the oxygen being sucked out of the air. That’s how it seems to me. We don’t see oxygen, but of course it is there.
There are plenty of theists who can understand it though. I would say most people in my circle of friends don’t overanalyze it in any way. Some of us believe, some of us don’t, and it is completely a personal matter and does not affect much of anything when we interact.