Mainstream Religion a Unifying Thread: Part IV Islam

In the last part of the series, we discussed Judaism and how its mystical tenets are often completely lost in the mainstream manifestations of religion. Islam shares the same problem. Not only is it old, approx 1400 years old, it is a successor to the Abrahamic tradition of Christianity and Judaism. With that said, it shares similar problems as the rest of the mainstream Abrahamic tradition.
Islam does honor the fact that Jesus most likely escaped crucifixion. The Maulana Muhammad translation of the Quran indicates:And for their saying: We have killed the Messiah, Jesus, son of Mary, the messenger of Allah, and they killed him not, nor did they cause his death on the cross, but he was made to appear to them as such. And certainly those who differ therein are in doubt about it. They have no knowledge about it, but only follow a conjecture, and they killed him not for certain. ....
This sheds some light on Islamic-Christian theological disagreement. ....Despite this amazing quality of the Quran’s revelation, Islam has I believed deteriorated from the Messenger’s intent, at least in the mainstream form. In the Quran the mystical tenets are very clear, and the metaphoric “Chastisement by Fire” should not be interpreted to be a brutal terrorist assault, but rather a description of the non-believer’s psychological state. It is partially understandable why the mainstream deterioration has been known to be so violent. Muhammad himself led an example of war, although his was just war, just cause, his followers could not live up to his example. Strife broke out immediately after the Messenger’s death, with who the successor should be. The modern Sunni and Shi’a sects were based on division between whether Abu Bakr Muhammad’s companion, or Ali ibn Abi Talib Muhammad son in law, should be the successor—civil war broke out.