Atheists Have the Most Logical Reason for being Moral

[orangebox21]

While theists would have us believe they have a monopoly on morality and the only reason to behave morally, I find that in reality is the atheist who has the most logical reason to act morally.

The atheist who refrains from doing immoral acts in the world where he must live is informed by the same logic that tells him not to pee in the pool where he has to swim.

There's confusion over this argument.  An illustration.  Let's say that you know if you kill Frank, then Frank's brother is going to kill you.  Certainly an atheist has a great reason not to kill Frank.  In the same way you wouldn't pee in a pool where you have to swim, your not going to kill someone in the world that you live because then someone is going to kill you.  But that doesn't explain why the action is immoral to begin with, only why there are reasons you've chosen not to do it.  You've assigned a moral value to a pragmatic action.  Why?  The argument isn't that an atheist doesn't have a reason to be pragmatic (defined as moral), it's that an atheist doesn't have a reasonable ontology for morality.    

As a Christian, I knew that my salvation was set in stone. God would forgive me and what other people thought didn’t matter. After all they were persecuting me because of my faith, not my behavior. I had absolutely no bases for moral behavior.

As a professing Christian weren't you being conformed to the image and likeness of Christ?