A couple of data points.
My first, my _very first_ college class many years ago was taught by a woman who spent the first ten minutes of every class talking about herself; just clearing her head, she said. Somebody complained, and the problem was rectified. She wasn't there to clear her head -- she was there to teach. Same argument to be made with this math teacher; he's there to teach math, not talk about spiritual life on a daily basis.
Second: in high school, I had a math teacher who kept a pile of Watchtowers -- Jehovah's Witnesses literature -- in his desk. Somebody snooped around and found them, and we all had a good laugh (not to his face). The point was, they _stayed_ in his desk. They were for him, not us, and he never once preached at us. I'm sure he was out there every Saturday morning ringing doorbells with the rest of them -- but that simply meant that he knew there was a time and a place for proselytizing, and it wasn't _every place, every moment._
This math teacher sounds like a Jesus drunkard; he's so obsessed with his religion that he can't function normally.
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