Dave Blount at Right Wing News provides a possible answer in "Atheist Calls for Eradication of Christianity":
Al Stefanelli, Georgia State Director of American Atheists, Inc. — the same outfit that has been raising a stink about a cross at Ground Zero — helpfully explains why it’s okay for militantly devout atheists to be such bigots. When they use our leftist courts to suppress Christianity, they are only being intolerant of intolerance:
"Intolerance toward beliefs and doctrines that serve only to promote hatred, bigotry and discrimination should be lauded, as should extremist points of view toward the eradication of these beliefs and doctrines....
Further down in his screed SATANELLI equates Christians with Muslims:
"The fact is that fundamentalist Christians and radical Muslims are not interested in coexisting or getting along. They have no desire for peace. They do not want to sit down with us in diplomatic efforts to iron out our differences and come to an agreement on developing an integrated society.
"They want us to die.
"Their interpretation of the Bible and Koran are such that there is no other course of action but to kill the infidel, and if anyone believes otherwise they are only fooling themselves...."
Some food for thought at the end of Dave's article: As difficult as it is to take idiots like this seriously, we need to try. Militantly atheistic regimes managed to eradicate well over 100,000,000 of their own subjects in the course of the 20th Century.