Swedish schools teach a Religion class, normally during the 10th year. I am not sure if this is mandated or if it's up to each individual school, but I read it while training to be an electrician, so it's rather wide spread.
It was basically the same as reading world history or social studies.
If you can get past the practical problems (US is more geared toward a specific religion than Sweden) then I think it's something worth teaching, even if the interest for it might not be that high among all students.
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