Well, is it RE or RS, because often people don't realise that it's RS - Religious Studies, which is entirely different from RE which most people studied at GCSE. I did RS for A level, you see...
If it were RS, I would definitely advise you to take it, as it's more respected than Sociology and is highly relatable to most degrees - a typical RS course is two of either history, literature or philosophy. If it is Religious Education, then I can't really help you there, but I'd say go for whichever is better for your future plans.