MINO's? ;o)
Of course you are right. They not only have different degrees of "observance", but there are different "denominations". Muslims are no more all united in belief than are Christians or Jews.
There is a fundamental difference, and it's seen when these religions go through their cyclical "revivals."
In revival, Christians seek to emulate Jesus, who fed, healed, and evangelized.
In their revival, Muslims seek to emulate Mohammed, who conquered, plundered, and proselytized at the edge of a sword.