Qcmbr, people weren't supporting Islamic teachings; people were stating that it was in no way unique, and CAN (and does) contain "moderate" versions of its beliefs when fully integrated into a Western society. Like all religions, it's malleable for good and bad.
Christianity is probably not the closest comparison, as it's just a retcon of Jewish religion, purposely made to be more nice, PC, and appealing in a more civilized time and place, comparatively (and thus easier to fit in with modern morals). For a near 1-1 comparison, one need look no further than Judaism, which is based on Holy Books that contain every single thing that you attribute to the Koran, but worse. However, Jews integrate into Western society now, for the most part, due to various reasons, but also due to choosing to interpret their scriptures in a much less violent fashion overall. However, in the Middle East, their scriptures are still used to further conflict.
So, no, their beliefs are no more "incompatable" than any Abrahamic religion - they would just have to "re-interpret" or ignore the non compatable writings like Western Judaism and Christianity do. As many/most due already.