There's a very large difference between killing for a relgious cause and killing for a non-religious one. Where your presentation utterly fails is in drawing that line. If you were to assume that all dictatorships that were against organized religions killed so for a relgious reason, you would also have to assume the same for governments that have any incriment of the relgions that you mentioned, in which case your numbers would be incredibly skewed. You're comparing two completely different numbers.