Aren all atheists Communists (or vice versa)?
All Communists may well be atheists, simply because their political system rarely exposes them to anything else. It does not follow that all atheists are Communists. Atheism is a view on the existence of the supernatural, not a political system. Some atheists favor some form of socialism. Many agree with the writings of Ayn Rand, who was a very strong supporter of both unbounded Capitalism and atheism. Many atheists are Libertarians and Democrats; fewer tend to be Republicans, but that is mostly because of their stance on church and state, not always because of their financial plans. Atheists come in all political flavors. We don’t feel that the Communist system does anything to promote well-reasoned atheism, so we don’t support it.