A story is told about a group of English theologians discussing the Gospel.
They were trying to define what it was about Christianity that was different than all other religions. To begin they talked about resurrection but other religions also deal with this, they brought up the death of God but other religions have within them a god who dies, they were in the midst of trying to determine the attribute that made Christianity unique when C. S. Lewis entered the room. He asked what the discussion was about, they told him. Lewis answered, “That’s easy, it’s grace.”