Teaching religions in schools as if they were true, should be a crime. I don't care if they teach about Hell or Heaven or whatever.
I must suppose that you mean compulsory religion classes? I have taken several world religions classes throughout my schooling and thought they were fascinating. Unless the instructor of said class is proselytizing, I have no problem with people being told about major beliefs from around the world.
The first class I had, World Geography, was compulsory. It only had a month-long religion unit, and there was no getting out of it. We were tested on Hinduism, Buddhism, Judaism, Christianity, Islam and on Atheism, though there wasn't much presented material for that last one. In such an anti-Muslim area of the country, my teacher gave quite a passionate defense of Islam and the nearly 1.5 billion people that believe in it. I came away thinking it was a very positive experience.
All the other religious courses I've taken were optional. My atheist friend once said this:
"I so wish public schools would teach the Bible! The Old Testament is so eye-opening... If people were to read the absurd things that God commanded people to do in those times, there would be many less Christians in the world."
I don't know if that's true or not, but it would be so fascinating to try! Most religions teach that they contain the truth. Would it not be a misrepresentation to present them any other way?
I have no problem with religions being presented as true in public schools, as long schools are willing to teach truths in secularism, atheism and science. How can it hurt to present both sides?