Because those three relegions are the only relegions that their followers believe in the one and only God, that is Allah.
Islam, Christianity, Juddhism (sp?)) should be respected.
Do you not realize you're here shouting about people disrespecting your religion, but in saying what you just said, you've disrespected countless others? You're saying that it would be alright to draw a cartoon about me because I believe in something beside the three you mentioned.
You can disrespect relegions, just keep your thoughts to yourself. And relegions not respecting your sexuality is another whole issue.
So much for keeping your thoughts to yourself for the sake of not disrespecting religions/people and their beliefs, right?
Your religious belief that there should only be three respected religions, is not the religious belief of everyone else. You're saying that our beliefs, those that aren't "Islam, Christianity, Juddhism" should not be respected and aren't legitimate (pissing on them,) while you want us to believe that noone should piss on muhammed er "Islam, Christianity, Juddhism " This was first a "People should be respectful to other peoples religious beliefs." I thought?
So which is it? Do you really believe people should respect other peoples religious beliefs or is it only "some" religous beliefs that "should" be respected?
You didn't literally say that other religions aside for "Islam, Christianity, Juddhism " should actually be disrespected. You did however use the word "Only" implying that no other religions should be respected. Implying that, doesn't leave very many options.

I hate people.