You can't assume that religion is completely positive.It's pretty much tolerance and intolerance.You can't "remove" religious extremists like that. There will always be starfishs who would kill people because of their beliefs.
It's called ''If you could make something legal/illegal, what would it be'' not ''What would you make illegal/legal that everyone can agree upon, has to be possible to all extents, and can't be negative in one way''