No FIRST of all islam means peace. Islam doesn't (NEVER will) teach you to kill also it's forbidden ....... Why it's populated ..? I don't know some because of ilahi songs some because they visited a mosque visited Mecca learned about Islam Etc . There are many things ..
Because it's a lot of Christian believers that are doing it. For example, they were the ones that started the misconception of the evolution theory that we came from monkeys. But it doesn't state that; it states we have a common ancestor with them. These are misconceptions that a lot of Christian believers tell their children so they will not be converted over to another side.
Islam doesnt teach violence any more or less than our Christianity does. The terrorists are a bunch of extremist zealots who have take a couple of passages and concepts from the Quran and twisted them to their own power hungry violent purposes then take other bits and misinterpret them then use them to recruit and corrupt poor, disenfranchised, less educated people who hate anyone who has more than they do. In other words rich men who want power get poor uneducated people who hate those they blame for their poverty and and use the one or two passages from the Quran to trick their own people into believing theyll get rewards from Allah for destroying those they hate. Muslim terrorists twist the Quran to say what it really does not. Christian terrorists (doctor killers, abortion clinic bombers) twist the Bible to say what it really does not. Zealots of any religion are crazy. They do not represent a religion as a whole or represent what that religion actually believes in or stands for. I do not in any way, shape or form believe Islam is right in much of what it teaches, and the way they treat women is abominable but the Quran is a beautiful book and is very much like the Bible in several ways. It does not incite or demand violence against others any more than our Bible does.