A better solution would be to cut that page out of the muslim books if they find it so offensive. But they don’t believe in the Christian hell anyway so why does it even bother them?
No, the best solution is - Tell them you are in an Italian school system and Italian literature is part of the curriculum. Dante’s work is an important part of that literature. Mohammed in hell is in “The Divine Comedy”. If you can’t stop taking this as a personal insult, then leave the school system. Otherwise shut up act like an adult. Part of an education is hearing things you don’t like if you can’t accept that get out! No more special privileges for Muslims! You.re going to be treated just like everyone else. That’s not good enough, then leave!