The actual quote is:

“Men never commit evil so fully and joyfully as when they do it for religious convictions.”

By: Blaise Pascal

http://en.wikipedia.org/wiki/Blaise_Pascal

Yep, religion gets involved in politics, war, nationalism etc. Not to mention big business and god dishonouring doctrines like hell fire, immortal souls, the trinity and many other non scriptural things… Interestingly Jesus mentioned these religious hypocrites when he said; (John 16:1-4) 16 “I have spoken these things to you that you may not be stumbled. 2 Men will expel you from the synagogue. In fact, the hour is coming when everyone that kills you will imagine he has rendered a sacred service to God. 3 But they will do these things because they have not come to know either the Father or me. 4 Nevertheless, I have spoken these things to you that, when the hour for them arrives, you may remember I told them to you.. . .

Then why did you?

Joyful? I don’t think they do it with Joy to kill others if religion is what motivates them. They might do it motivated by there belief that their god wants them to clean up the non-believing sinners that will go to hell anyways.

But with Joy.. I think not…