You haven't been apparently paying attention to Islam....They are growing, they aren't PC...and they keep building.
Would muslims qualify..for showing you any "organized religion who doesn't think their brand is right and everybody else is wrong"???
Muslims definitely think their brand is right and everybody else is wrong.
It would be nice if more Christian sects felt the same. No hallowed-out church will ever beat them with a "believe whatever, ten suggestions" PC mindset.
Indeed, they might even fail to survive.