If it was a case where they were to visit a Buddhist temple, a mosque, a synagogue, and the local New Age bookstore, for "off site religious education" someone might make a case for it being an overview of religion in America. But Bible classes? Nuh-uh.
(Mind you, I actually took Bible classes when I was growing up, and thought it was pretty interesting. But I sure didn't do it on school time, except for the brief period when I was enroled in a private Lutheran school. Notice that word: private.)