I agree with Cynthax, whilst I'm not all that fond of the Bible, it serves as a useful accretion of Bronze-age myths that might otherwise have been lost. Whilst it may seem easier to try and sweep away any religious writings or religiously-inspired texts, it's important to remember that, for the majority of human history, the vast majority of people were deeply religious. To deny access to religious works to schoolchildren would be to deny an enormous amount of our cultural and intellectual history.

I don't think that the current state of affairs (Biblical myth being passed off as authentic history) should be allowed to continue, but certainly, a wide ranging education in a variety of religious sources could only bring about a more informed and less dogmatic generation of schoolchildren. No one is asking children to believe on the ridiculous catalogue of bunkum that makes up religion, but certainly an understanding of biblical texts (for allegorical purposes) would serve to benefit anyone wishing to read the great literary classics.

As a side note, without the background of early, intolerant Christianity, the world might never of heard of Prophyry or Celsus, my two favourite classical writers.