Obviously, there are people who sincerely view themselves as Muslims who have committed horrible acts in the name of Islam.

do you agree?
It's a truth. Muslim terrorists commit their barbarity and then claim that they have acted as per the verses of Quran. In Quran, there are more than 100 verses which urge the followers to wage Jihad against the infidels. None of the radicals belonging to the other religions will claim that they are committing terror acts just because their holy book offers 72 virgins if they blow up in public places.
Yes very true islam is only religion which promises island to have sex where you will be alone with 72 virgins. All muslim supporters what you have to say on the islamic verse stating the above promise??
There are so many verses on their holy books (the Quran and the Hadiths), which are incompatible with the modern society. But the so called "progressive" Muslims will never say anything against them, because either they secretly support these verses, or because they are afraid of being labelled as apostates. Anyway... I just hope that it is the latter case.