I believe, because, despite what your post claims, there is not overwhelming evidence against my belief. You seem to claim to have evidence that God definitely does not exist. What is that evidence?
I don't think that it can be proven either way and for me that is a reason not to believe.
There are many hypotheses that can't be proven. Why should I believe in any of them?
There seem to be two schools of thought about theism, that a deity's existence can be proven, and if that were true it would be a reason to believe, I suppose. The other is faith, a tenuous concept to say the least.
If a deity exists what purpose would such a belief have? You can be just as good being a non-believer as you can as a believer.
There are plenty of reasons not to believe, such as the problem of evil, a problem with no adequate solution in my opinion.
Fundamental misunderstanding of Christian philosophy.
All humans exist in a state of deprivation and separation from God because sin is universal. We all lie, cheat, steal, etc. The center of Christianity revolves around the idea of reconciliation and forgiveness, not moral virtue.