Can anyone here, without usuing the usual canned answers of religion persecuting the massess etc., explain why someone having and professing their faith in God, Allah, Buddah, or even nothing bothers you to the point of slinging insults at people?
Perhaps it lies in the fundamental structure of a religion that colors a person's/population's ability to more or less tolerant of other faiths. For example:
1) Monotheism- if your religious proclaims that the universe if governed according to the laws/judgements/rules of a single diety, then it may be quite difficult for you to accept that the diety of another religion is just as legitimate and true as your own. In contrast, a religion that is fundamentally polytheistic may feel less threatened by the inclusion of other dieties from other religions as part of a larger cosmic whole.
2) Prostelyzing/Conversion - If your religion dictates that is is ones duty or that it is acceptable to actively seek converts to your religion, there needs to be some element of rejection of the "other" religion(s). Thus, it would seem that those reigions that place the burden of conversion/missionalry work/prostelyzing on its members would have to some extent make it implicitly understood that any religion other than its own is always ultimately unacceptable. Those religions that do not actively seek out converts, it would seem, do not need to place as much emphasis on the negation of "other" beliefs.
3) Cyclical vs Linear world view: If your religion teaches that there is only one life, one path and one judgement, then it would seem that could make alternative beliefs a threat to that absolutist-type world view. However, in religions that posess a cyclical view of life - reincarnation, multiple lives, or even multiple saviors - then it would seem that "other" beliefs would be less threatening, and could be accepted as only one of many manifestations of one's thoughts/beliefs/beings that continuously reappear in varied forms.