“It’s impossible to know anything about God.” You would have to know a great deal about God in order to know that you couldn’t know anything about God (I mean anything else about Him). At the least you would have to know either that He doesn’t exist, that even if He exists He doesn’t care whether you know about Him, or that even if He cares He is incompetent to tell us anything about Himself.
“I’m not saying there is no God. I’m just not religious.” How curious that the Lord of the Universe might exist, yet not be important enough to think about.
“Of course there might be a God. I just don’t know.” You are either living as though He did, or living as though He didn’t. If you don’t know anything at all, then how did you choose?
The psalmist famously wrote, “The fool says in his heart, ‘There is no God.’” Did he call the man a fool for not knowing God is real? Or for knowing God is real, but pretending to himself that he didn’t?
Few people lose belief in God, and then do wrong. The more often traveled path is to do wrong, excuse it, then look for reasons to disbelieve in God.
Also on the topic:
Fall of a Freshman
Atheism, Capital “A” and small “a”
Secularism and Its Children
The Skeptic as Penelope