Religion is an ideology. Are you saying Nazism and Communism aren't evil ideologies? There were Nazis that followed the party beliefs to the letter (ala fundy Muslims that follow the Koran to the letter), and there were "Nazis" that didn't follow the ideology except to survive in their environment.
So, there were 'good' Nazis and 'evil' Nazis?
To your first point, Islam does not promote evil any more than christianity does. I have been down this road before and can match any Koran verse calling for killing with an equivalent bible verse.
Christianity was used by some to justify the mass killing of others. That does not make Christianity evil, just those that perverted it.