It is similar in that it did not force anyone to be generous. Christians willfully gave of their time, talents, and riches to help the poor, feed the hungry, clothe the naked, and support the widows and orphans. There was no government mandate, no big brother program, no mafia style gastapo forcing them to do it. They did it because they loved their neighbor.
Now you tell me – How is paying more taxes so the government gets to decide how generous you will be in any way more Christian than having the freedom to be generous with your own money?
The difference in today’s capitalism is not in the economic system, but in the level of greed among the people. (Sadly even among Christians) When greed and laziness increase, the effectiveness of capitalism decreases, and the more people are duped into thinking the government is the answer.
You cannot replace big G (God) with little g (government).