Communism and Christianity seem to go perfectly together to me. Matthew 6:24 - "No one can serve two masters. For you will hate one and love the other; you will be devoted to one and despise the other. You cannot serve both God and wealth." I'm a secular capitalist so take my words with a pinch of salt.
I was raised Catholic, but am now an agnostic/atheist depending on mood at the time. Most of my adult life, I've been opposed to the idea of religious movements, religion getting entangled with politics. But the pope saying these things, what with everything going on in the world: I can suddenly see why religious movements have been successful in the past. The people are revolting against their leaders? They are nothing, they are powerless, the government can feel free to stamp them out as dissenters, traitors, try them in courts of law. But the head of a major worldwide religion putting out messages to the world asking, in clear terms, a revamp of capitalism, money in politics, how governments relate to its people, and so forth? Wow. What a time we live in. We are a cog on a wheel in a system revolving through time and space, cycles and patterns in a long thread of repeating events.