Earlier quoted context omitted.
That's irrelevant. What matters is this assumption that every detail of a person's religious tradition directly and literally translates into an indicator of their ideals and behavior. In reality the number of people who take their texts that literally is small, both in Islam and Christianity. And those are the circles that terrorists come from. And their evil has nothing to do with the name of their religion.
That's a goalpost shift from the original post commenting about how these specific mosques were shrines to a warlord who committed actual atrocities. This wasn't an "assumption", these were actual events orchestrated by a real person.
If you want something more concrete, the Catholic church committed atrocities during the crusades (which were conveniently also around the 10th and 11th centuries), and there are still statues and altars of historical saints and popes.