They have some good songs with excellent and straightforward lyrics. Great for learners, and easy to understand.
I want to be far away from all of this
They're a very popular Polish band with a different worldview to the stuff you suggest which is on the ultra kitsch side of kitsch and contains religious proselytising. Behemoth however seek to convert nobody to the band members' personal views and they have a very educated and erudite frontman. By all accounts a very decent guy too. Their lyrics are clear, excellent, and make very subtle yet attainable cultural references.
Im a pole and for me
Proselytising via language learning. A bit like the Mormons and their 'free English lessons'.
I would have burned them on a stake just in case.
Very open-minded of you.
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