Believing in something is an action. I'm not convinced by 'evidence' towards the existence of a God, so I pick the path of inaction. The concept of religion is not important to my life. It provides good fodder for arguments, which I quite enjoy, but that's irrelevant to my spiritual laziness. I don't have a reason to find God, so there's no motivation for me to do so. If I felt like the presence of a belief in God would improve my life, then there's no good reason for me to not follow that.
The existence of a God is literally so unimportant to my life that I rarely even consider it. I'll say things like "Oh my God," "Jesus Christ," etc. all the time, but they're expressions stripped of their religious context in my lexicon. When bad things happen, I don't think "Why, God?" and when good things happen I don't think to thank God. The only things that remind me that the concept of a God exists are religious people practicing their religion and atheist people practicing their lack of religion.