Kerry King is a dumbass, and all your points have just been tossed out the window.
Relegion is nothing but a rool book to live your life. Every relegion has extreamists, you can't blame a race of people becuase a selection of people who follow the same relegion decide to fight wars. A bunch of stories with a lesson in each one. If someone doesnt like the story they will re-write it, and created a new branch of the religion. Being Christian is just a short way of telling people what rules you live life by.
Same with the Coran, there are mussilms who dont suicide bomb people, believe it or not.
You wouldn't blame John Lennon's death on J.D. Salinger, because some douche read Cather in the Rye and decided to shoot a beatle.