Tim Keller pastor of Redeemer Presbyterian Church explains the difference between all world religions and Christianity,
At the end of The Abolition of Man, C. S. Lewis demonstrates how the major religions agree on certain moral absolutes. Christians find that in today's culture wars, they often are on the same side with believing Jews, Muslims, and Hindus. The Christian preacher seems to be saying, "Be moral," along with exponents of other philosophies.
But when we ask, "Why be moral?" the other systems say, "In order to find God," while Christianity says, "Because God has found you." The Christian gospel is that we are not saved by moral living, we are saved for it. We are saved by grace alone, but that grace will inevitably issue a moral life.