Well, watered-down Christianity is like watered-down liquor. It doesn’t get the job done and nobody who has experienced the real thing prefers it.
"Watered-down Christianity" = Protestantism, no requirements at all, none.
However, that doesn't sound very nice. I know Protestants who are charitable, good, worthy followers of Christ and they go to Church every Sunday, no excuses. They aren't "watered down" at all according to their own Protestant lights.