Athiests

Why are most athiests so concerned about the actions of Christians?  They do not want prayer in school, no Nativity scenes in public places, and the list goes on.  What is it that they are so concerned about?  Do they really think that the average Christian is out to make their life unbearable or to impose their religious will upon them.  What really motivates an athiest?  What is the driving "force" behind their behavior?  True Christians will respect the beliefs and norms of athiests.  Why is that behavior not reciprocated?  One must ask the question why?  Athiests search for issues to raise in our courts.  It is hard to find cases whereby Christians assail athiests for their beliefs by using the courts.  Why is that?  I know the force behind the Christian's actions.  I believe I know the force that drives the behaviors of most athiests.  I think of it this way, if they are right and I am wrong, then in the end, what does it matter.  However, if I am right and they are wrong, only goodness can prevail.  How can they be concerned or adamantly oppose that?