What religion they are is irrelevant; what is relevant is that there is no shortage of murdering, psychotic monsters in this world and more than a few of them like making irrational blanket statements condemning one group or another to death.

Some of them are religious, and some are not.
Some of them are world leaders, and some are not.
Some of them are housewives or husbands and some are not.
some of them are students and some are not.

The list is nearly endless the point is: there are monsters in this world and no sooner do you get rid of one and another shows up.
Face it, humans are deeply flawed creatures.