I think RE was traditionally considered a facilitating subject but has become extremely dumbed down in recent years. Lots of sitting around waffling vaguely about subjects which students have almost no factual knowledge of. And vague "craft" type projects. And watching TV in class.
"A Head of RE once recounted to me how at the start of year INSET, her headteacher had given her a bottle of wine and praised her. The reason for this was that both she personally and also her RE department, had achieved the best GCSE residuals in the school. Requests to observe her soon poured in from other teachers asking ‘how do you get such great results in an hour a week?’ ‘How do you get the children so engaged in your subject?’
"After weeks of dodging observation requests, and pretending that she possessed some sort of magic beans, she decided to come clean. Whenever a colleague asked if they could observe her GCSE lessons, she gave them an exam paper and mark scheme and told them that if they still wanted to watch her after reading it, they would be welcome. No one came. ...
"Courses which are ‘accessible’ (by which I mean easy) and ‘relevant’ (by which I mean don’t have much to do with religion) have masked a multitude of sins. Entry numbers have remained healthy, but pupils have remained religiously illiterate. Pupils have achieved A*s, but no real knowledge of religion."
www.reonline.org.uk/news/think-piece-thoughts-on-the-gcse-re-proposals-david-ashton/
See also these blog posts which describe the dumbed-down nature of current RE in more specific details.
thegoldencalfre.wordpress.com/2014/09/11/why-gcse-religious-education-fails-pupils/
thegoldencalfre.wordpress.com/2015/04/01/why-are-we-watching-shrek/
thegoldencalfre.wordpress.com/2014/10/27/the-banality-of-fun/
I teach my daughter knowledge about world religions at home, and would continue to do so even if we were in the UK, because I know perfectly well that unless she attended a fantastic private school (or a VERY exceptional state school) it is unlikely that the school would be equipping her with a proper knowledge of the religions of our world.