Well that's the difference between an atheist view and a theists view of reality. The atheist says it's just all about survival, so if you believe that, anything is moral.
No, that is wrong. First of all, there is no single morality that all atheists subscribe to. ALL they agree upon is that there are no deities.
In my view, morality is based on thinking and caring, not just on survival. Human well-being is the fundamental value. Survival is certainly one component of that, but so is the ability to live a satisfying and fulfilled life.
The theists generally believe that the deity has rules for behavior and morality.
God did allow sin to be a possibility... some people blame him for that...I think it's silly given they wouldn't even exist without him creating them. Have a little gratitude, I say.
I think it is possible to make moral judgements on the characters in the Bible, including the character of God. Do they promote human well-being or not? And, when a clear judgement is made, that God is a cruel, vindictive, egotistical, genocidal maniac.
In my view, creating us isn't enough to counter that evil. of course, I consider the whole story to be fiction, so it isn't really a problem.