As per the other thread about what it might take to believe in God, and presumably this might apply only to those who do have a belief in the one God, although it also might apply to others.
I believe in God.
I'm either right or wrong.
If I'm right, I could only stop believing in God if I start accepting error over truth. I would have to allow myself to be deceived into thinking that my perceptions of God's revelation of himself to me, has another source, and it's not God. I believe I'm vulnerable to that deception to the extent that I stop doing the things that bring me close to God.
If I'm wrong, and there is no God, I'm not sure anything will convince me of that. It probably would have happened by now. I don't know what would convince me that that which I experience, as being from God, is actually all in my head.
So if I start to doubt God's existence, my first internal reaction is that I need to do better at that which brings me closer to God. The confirmatory experiences return as I do so.
So if I'm right, I'm right and plan to stay right forever.
If I'm wrong, I see no exit from my belief.
But hey, I'm right.