muppetWrangler nailed it.
I would scrap RE altogether and replace it with philosophy. You could cover the teachings of the major religions without the subject being bound by them.
We’ve done this to death before but,
There is a difference between teaching Religious Education as a subjective / theory subject and as fact. Teaching about religion, what different belief systems have thought over the years, maybe a look at what some of the various texts have to say, is no different from other arty subjects. There’s arguably a value in discussing what some people think about the Bible in the same way that there’s a value in teaching what some people think about Tennyson. At this level, I think RE should be taught in schools, though I fail to see why it should be mandatory come Options time.
Where it becomes a problem for me is when a given religion is presented as fact, and it starts bleeding into other subjects like History and the Sciences. It’s not fact, not even if you really really believe it a lot.