Zeus Just Told Me You’re A Loser
I used to teach literature in a public school myself, so my advice for all teachers is to stay as far away from the Bible as you can unless you’re in a school district filled with people who expect you to talk about the Bible, in which case you need to stay far away from that whole area. Anything you could possibly say about the Bible is offensive to either an atheist, a religious non-Christian, a religious Christian who views the Genesis story as a metaphor, or a religious Christian who thinks Genesis describes the literal beginnings of our 6,000-year-old world. Say anything Biblical you wish: among those four groups, at least one will contain people offended by your statement.
That’s not to say that teachers should avoid mentioning religion at all. No, school teachers — especially when they cover literature or reading — are perfectly free to discuss the mythologies of ancient Greece and Rome. And ancient Egyptian gods like Osiris and Ra, if they ever come up in the course of a lesson. Odin and Thor from the Viking days are safe, too. (On second thought, maybe not. Some neo-Nazi and white supremacist groups use Norse mythology in their ravings, so the wise teacher avoids Vikings and their gods whenever possible.)
Basically, the rule is: never say anything remotely about or connected to any religious belief unless its followers have been dead for a minimum of 1,600 years. Once a religion reaches that happy milestone you can say anything you want.
Suppose there were still a number of Americans who believed the Greek myths? Then you'd have geography teachers getting in trouble after devout Zeusian parents complained: how dare you show our children photographs of Mount Olympus topped by ice and snow rather than the palaces of the gods! Your talk of “science” is no excuse for contradicting the deeply cherished tenets of our beliefs.
Other Zeusians will be furious because Zeus is a good, decent god who would never disguise himself as a swan just to have sex with a human woman, and how dare you pay attention to those parts of our religious texts which suggest he’s ever done this? And of course religious and non-religious non-Zeusians alike will be furious that Zeus was ever mentioned at all.