What is the most evil religion?

Sunni Islam.

Shias are okay though; they're a bit more rational and kinder to other religious minorities.

This is the same as asking which cancer would you like to die from.

-With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion.-

Steven Weinberg, quoted in The New York Times, April 20, 1999 US physicist

-Since it is obviously inconceivable that all religions can be right, the most reasonable conclusion is that they are all wrong.- Christopher Hitchens

PS. Forest is an idiot or a liar:

Second, Nazism and Fascism were not atheistic in the first place. Hitler thought he was carrying out a divine plan. Nazism received extensive support from many German churches, and no opposition from the Vatican. Fascism happily coexisted with Catholicism in Spain, Italy, Portugal, and Croatia. See p. 677 for discussion and references.

Third, according to the most recent compendium of history’s worst atrocities, Matthew White's Great Big Book of Horrible Things (Norton, 2011), religions have been responsible for 13 of the 100 worst mass killings in history, resulting in 47 million deaths. Communism has been responsible for 6 mass killings and 67 million deaths. If defenders of religion want to crow, “We were only responsible for 47 million murders—Communism was worse!”, they are welcome to do so, but it is not an impressive argument.

Fourth, many religious massacres took place in centuries in which the world’s population was far smaller. Crusaders, for example, killed 1 million people in world of 400 million, for a genocide rate that exceeds that of the Nazi Holocaust. The death toll from the Thirty Years War was proportionally double that of World War I and in the range of World War II in Europe (p. 142).

All religion is evil

@Willam

Atheism isn't a religion, it's the lack of a religion. But gold star for being an idiot.

I think no religion is actually evil, they can just preach a lot of hate or darkness. Christianity (hatred towards Jews, Muslims, non-christians, homosexuals, lesbians).

In intention... um, I don't think any of them are evil per se.

In practice, at this time, Islam. It used to be Christianity for a very long time.

Christianity

Religion itself.

define evil

Egoism.

Yes.