See: http://tellthechildrenthetruth.com/
Why?
1. Muslims believe they have the obligation to kill non-believers (kaffir)
2. Musle ims believe that they, too, have a Messiah, who will receive the support of a second-coming of Jesus.
3. Muslims believe they have the obligation to force the world, by the sword, jizya, or conversion, to be completely Islamic or subjected to the jurisdiction thereof.
Illah was a god of pre-Islamic nomads. The appearance of similar beliefs is akin to knock off merchandise. It’s fake. Allah is not the God of Abraham, Isaac and Jacob. Because Muslims can lie as a matter of practice (taqiyya), their protestations are not to be believed.
Why don’t they get along? The top of the Dome of the Rock, in gold, is inscribed with “God has no son.” Well, He does. Muslims will kill you for believing that.
The Islamic culture’s rules are antithetical to freedom. See the hadith, judgments by qadis (judges), and the merging of theological ‘fatwas’ with governmental edits.
There will only be peace in a Muslim world when there is only islam. So, ‘islam’ (submit) or die.
I have studied Islamic culture for fifty years. Think of the whitewashed streets of houses in Southern Spain. The white walls of narrow streets belie what’s inside, which is often beautiful. Islam hides its true belief system with similarly whitewashed fronts.
Oops. Edicts.
I forgot to mention to you to research the Nazis who left Germany after WWII only to become powerful throughout the Middle East, especially in Egypt. There are names you can lookup.