Read the article entitled "The Great Revolt." Expand the article by clicking on the "pop-out" box located at the top-right corner of the image (it only appears when your mouse is hovering over the image).
If you have trouble answering #3 based on the article, read the following:
Polytheistic religions tend to be more accepting of other polytheistic religions. When a polytheistic empire, such as Rome, conquers other polytheistic religions, the conquered do not simply switch one set of gods for another, but add the gods of their conquerors to their pantheon (all of the gods of a religion). For monotheistic religions, like Judaism, Christianity, and later Islam, this is impossible. For them, there is but one god, and asking them to accept additional gods into their worldview would mean betraying their faith. The resistance of these monotheistic religions to accept Roman culture and religion let to increasing friction.
Watch the video to the right in order to answer the questions on the Great Schism