First up: Christians.
They believe in a book written thousands of years ago, and refuse to believe scientific teachings. They believe their God is a peaceful and merciful creature.
Next up: Muslims.
They also believe in an old book, and they believe in a hate-filled God who is hellbent on killing Jews, Christians, and whites. They don't believe scientific teachings, either.
Next up: Jews.
They were around the time of Jesus' life and death, and they worship pigs for some reason. You can't eat pigs. No pigs. Eat pigs and you'll go to Hell, and that's that. Oh, and if you're a Jew, you get pissed-off Christians beating you up because you killed Jesus.
Next up: Buddhists.
They believe in an ancient, peaceful and happy God, revolved around a perfect nirvana of happiness and inner peace. They don't get noticed much, except for monks, in their robes. This also appears to be the religion on RuneScape, because all (good) monks wear robes and they also think like Christians.
Next up: Catholics
They can't take a joke, they believe God wants everyone disciplined to fall under an almost Communistic ritual of Don't do this don't do that. They think that everything is unholy.