yep.
historically, it is useful (and imo fascinating) to learn how faiths have developed spread, and influenced history.
i remember one textbook i had in middle school, which described the dawn of Chrstianity from a number of persectives. it described briefly person of Jesus (an influential Jewish teacher who was crucified) and made clear distinctions between what His followers believed about Him (e.g. His being the Messiah and His resurrection from the dead) versus what the world could say about Him (was very influential, was crucified, etc.)
the textbook documented how the faith spread geographically, why it spread (appeal of monotheism to many polythestic Romans, the compassionate and simple teachings of Christ, belief in the resurrection), and what influence Christiaity first had socially and historically.
a religion should be taught, making clear the differences between what *adherents* believe about that faith / its central figure, and what can be historically, objectivly declared about that faith / it founder. the class should summarize basic teachings / principals, and explore how / why the faith spread, and what influence it had socially / politically over time (e.g. Emporor Ashoka and Buddhism)