You're unlikely to find any sort of religion/spirituality in public schools in the US. That would fall under state promotion of a particular religion, which is strictly verboten. (Or at least adherents of other religions would see it that way, regardless of the actual content of the class.)
The only way to get something like that into the curriculum would be as literature, as anthropology, or as comparative religion, and all of those are much more college-level than high school-level topics.
I think presenting it as cultural rather than spiritual would fly. And ok at high school level in a school with a solid academic college-prep focus - in my Jr yr at HS I had an English class called Traditions that included Greek and Roman mythology and some Old Testament among other things, specifically presented as literature.