True Muslims believe in the same God that Christians do, they just call Him, Allah. They even call Christians and Jews "Children of the Book". They believe in Jesus but call him a Prophet, not the son of God. They do not believe in the Holy Trinity as to them there can only be one God.
There are extremists in every religion, who want to kill everybody that doesn't follow their religion (Northern Ireland anybody?). It is sad that people want to hurt and kill one another because they believe that their imaginary friend is better than another person's imaginary friend. After all, they all can't be right, can they?
Protesting about this video, and violently protesting, has only made me want to watch it, and made it's presence known to the world. Protesters in Sydney even admitted to not having seen the film, but hating it's content.