Having spent a year in an Islamic country and having encountered many other Muslims since, I have found their belief system to be a tad hypocritical. Most Muslims are illiterate, still, and they've all had their local Imans and other clerics tell them what the true meaning of the Koran was. The interpretation depended upon the cleric (much like Christianity).
Their abherence to there religion was harsh and the true peacetaught within the religion was only applicable to those who not only believed but obeyed. They are taught that anyone who is not of the "true faith" (Islam) is an enemy of their church and of their God. They are also taught that deception and misdirection are acceptable tools in confounding their enemies.
When I was in Turkey, I studied the Muslim religion a bit, because I was still searching for my religious belief system.
What I discovered then was that Mohammad was actually a Christian Prophet who emphazied the teaching of the Torah and Mosaic laws (eye for an eye). The other item that was emphazied was the reward for dying in service to God.
When I was in Japan, I studied Shinto, and while in Thailand I studied both Buddahism and Hinduism. My conclusions from learning and comparing all of the major religions, including Catholicism and Christianity, was that they were all based on the same set of basic moral philosophies and tenants but they all went astray in the details.
I decided not to join a church until I found one that could answer all the questions that I had developed in studying all the others. Today I'm LDS (Mormon).
You are free to believe as you wish, worship the God, the established or unorthadox sectarian beliefs, or the absence of of a God, of your choice. But in the end, if it is a truth, it is of God, if it is not a truth it is not of God. If you believe in, live, and teach truthes, it doesn't matter what belief system you attach yourself to.
One of those truthes is Know your enemy.