It's attitudes like this that probably could gain a bit of insight via the teaching of other world views such add religion.
The "OMG I don't want to be exposed to other viewpoints" from the nonreligious perspective is just as close-minded as when it comes from the Bible thumping perspective.
In North America, an understanding of Christianity does help for understanding some literature, since so much literature from the past couple of hundred years references aspects of Christianity. So from that perspective, knowing bible stories etc, can help a student in English class.
However, the problem with religion-based schools is that many of the teachers and definitely the administration are inherently biased towards a single religion, and often try (both consciously and subconsciously) to indoctrinate the students with those beliefs.
I personally would rather see my kid taking religion courses in university for example, where they look at various religions at arm's length, with historical reference and comparative study.
The good news though is by high school, many students have enough understanding of these things to not be brainwashed by a few classes. The bad news is that in a lot of these schools, these classes are bird courses, and for many a complete waste of time.
I'm obviously biased against religion classes because I'm an athiest, but then again, I probably wouldn't be so biased if it weren't for a family friend who is a Christian missionary. Obnoxious one sometimes that tried to convert us, until someone made it clear to her we were not at all interested.