Capitalism is built on the principle of greed. It suggests that greed will motivate people to earn more money, and not make bad decisions because nobody wants to lose everything. In this system obvously there will be rich and poor, because not everybody is as motivated, but according to ones ability and giftedness they will be able to make money.
Communism, often seen as a great evil, is built on the concept that all humans are equal and should be equal. It believes that everybody gets an equal cut of the financial success of the country. This system is usually less productive, but it also attempts to eliminate the divide between those who have and those who do not have.
Now I am not attempting to suggest that we should be communist, or even promote communist princples. I just wonder why as Christians we are so determined on supporting capitalism when it is founded on a principle that is so obviously anti-Christian?