Learned this in Sunday School last week:
"Do you know the difference between religion and Christianity? It's two letters versus four letters.
Religion is spelled with two letters - D-O. Religion is a list of things people think they have to do in order to be accepted by God-go to church, give money, keep the Ten Commandments, say the Rosary, be baptized, pray every day. The list is endless. It’s always Do …… Do …… Do. That’s what religion is all about. If you want to go to heaven, you’re going to do something and keep on doing it until the day you die.
Christianity is spelled with four letters-D-O-N-E. Christianity is not based on what we do but upon what Jesus Christ has already done. If you want to go to heaven, you don’t have to do anything; you just have to trust in what Jesus Christ has already done for you. That’s it. That's the whole difference — Do versus Done.
Either you do it or you believe that Jesus Christ has already done it for you."
Ray Pritchard, "Sola Fide: By Faith Alone," Series: The Four "Solas," © 1997, Delivered on July 13, 1997 to Calvary Memorial Church, Oak Park, Illinois. Online: available at http://www.cmcop.org/sermons/071397.HTM, Accessed: July 18, 2002.