Are you a troll?
Also, what is a moral basis? What does that phrase mean?
Are you asking for a secular ethical system, or are you asking why atheists are moral?
And Christian morality is based on the opinion of the people that wrote the Bible, or the opinion that the Bible is inerrant and that your interpretation is correct.
You assume those things are immoral because if your interpretation of the Bible. That is circular.
Anyway, my morality would agree with pretty much all the things you said. You could say that if everyone followed my ethical system, then society would be better too.
It had better no be those darn amoral monkeys again.
Are we assuming that they are both murderers and rapists? Either way, definitely the Christians.
The decent guards of course.
Christian, of course. I don't know what that is meant to prove though. I'd rather be with people who are against murdering and raping, rather than people who have murdered and raped, and still think it is ok.
I'd rather be with repentant humanist atheist, rather than a self-righteous rapist murderer, who claims to be doing it in the name of God.
Personally, I don't judge the worth of a moral theory based on how well it coerces messed up people into being decent. I'd rather a true and reasoned moral system.
You seem to be be concerned about controlling action regardless of the truth, whereas I care about truth as well as people being decent to others.