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That's a myth.
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I suggest you read up again on the writings of various Communists. Atheism is a foundational tenet of Communism. The phrase "Opiate of the masses" was not coined by a libertarian.
Please don't take my words out of context. When I said, "That's a myth," I was responding to the claim that atheists themselves adhere to "communism". I thought my post was very clear. But let me make it more clear: Communists may be atheists, but that doesn't mean that all, or even most, atheists are communists.