I’ve felt a weird confluence of competitive juices splash upon my psyche as I read about former believers or theists pursuing lives without belief in “God” and then publishing their atheism as if it were some kind of exalted triumph.
At no time in my life did I have a belief in the reality of any gods (which I imagine includes whatever one you believe in), so it is not a matter of not believing "anymore."
Which God did you have in mind? The framing of the question contrasts the different view the believer tends to have compared to how an atheist or agnostic approaches the subject.