Mandatory World Religions flop or not

High schools should not make world religions a mandatory course because there are too many to cover, people could get offended, and it is a waste of school funding. Firstly, there is no possible way to completely cover all of these religions in one curriculum, there are over 4,200 religions in the world and there still new ones being created every day. Secondly, students may get offended about certain religions or about how you teach theirs. In conclusion, this would be an overall inadequate use of school funding and if the schools wanted to they could make it an elective instead.