why is it that theist consider people that believe other religions or follow other beliefs Hiethans?

Question

what gives them the right to down grade others, and decide whats true.

theist:: Christians, Chatholics, Jews,
Heithan: everyone else

Answer 1

It is simply a matter of the point of view. A citizen of the United Kingdom views a citizen of China as an alien, and a citizen of China views a Brit as alien. The same goes for religions. The Jews look on the Muslim a heathen and the Muslims look on Christians as heathen, etc. Their beliefs teach that those who do not follow certain ideals are heathens.
For the most part, they do not degrade others, but instead try to convince others that their way is right. It all depends on which side of the argument you are standing. It is just a word; an impolite word to be sure, but still just a word.