When you guys talk about having an elective on religion, I'm going to assume you're speaking about teaching the practices of religion. Such as proper prayer rituals and whatnot. Analyzing religious texts is another thing, but having such highly specific classes in a level of school which is supposed to give students the general overlay still isn't an acceptable idea.
The idea that students should have an elective course on religion or the idea that having an elective on religion is not educationally apprehensible, is complete and total bullshit. We already educate students about a wide variety of religions from a historical and geographical standpoint, we do not need an extra class to teach the students the nuances of religious practice. Because 1) various individual's interpretations of what religions should practice is highly subjective and varies pretty much from individual to individual, and 2) knowing how to properly follow a religion is not education. It could hardly even be considered a skill, due to the fact that anyone with half a brain could execute those procedures. We'd be doing kids an injustice to waste their time in such a manner.
And guess what happens when all the other classes are filled up? What if a student forgets to turn in their choice-sheet? That's right, atheist Johnny gets stuck learning how to remove thetans and read magical plates out of a hat.