Of course they can't.
What the devil would like is for man to believe that he can do good, have good morals, without Christ.
This post was a quote from a movie by the way.
Satan doesn't want man to "behave badly'' so much as he wants man to behave independently.
To that end, decoupling Christ from good morals is a genius tactic.
To that end, decoupling Christ from good morals is a genius tactic.