If pupils were taught about a wide range of religions...
I had a "History of Religions" class in high school that was exactly this. Foundational texts, creeds and belief systems for most major religions and a few minor ones too. Was an amazingly interesting class, and helped me be more empathetic and understanding to people who are very different from me.
A class like that would be amazing as a general thing for everyone rather than just a class for a small private high school in Romania.