Wikipediaに""Quietism" has functioned (...) as the shorthand for accounts which are perceived to fall foul of the same theological errors, and thus to be heretical"
という文があったので"fall foul of the same theological errors"？ "commit the same theological errors」とか「fall foul of the same theological rules」じゃねえのかと思いながら「fall foul」を MW辞典で調べたら「to get into trouble because of failing to do what is required by (the law, a rule, etc.)」とだけしかなかったので、やっぱり間違ってるじゃん！

・・・と思ったら、wiktionaryに「(idiomatic) To be defeated or thwarted (by); to
suffer ( + of)」とあったので、つまり「suffer the same theological errors」ということなのかという理解に達しました。