I am somewhat surprised at the reaction to the teachers statement.
Then the teacher said that: "Islam only exists to justify war and paedophilia".
I am sure those were the sentiments expressed, but I doubt they are all of the words.
I know my school days ended some half a century ago, but then, the teachers often added statements of "popular sentiment" to stir the pot, and encourage thought around real points of view.
If the teacher had said I have seen on the web that "Islam only exists to justify war and paedophilia" what do you think?
Such ways of teaching may not exist in the USA, I do not know. But they can be very effective.
As the point of view, as expressed, is hardly defensible, I doubt very much it was the Teachers actual belief.
It they are truly of such extreme convictions, it would be unlikely to be the only such incident.