17 and wondering about becoming a barrister?

I am 17 and currently in lower sixth form at school studying Pre U English and Art, A level Theology Philosophy and Ethics, and AS Maths and I am wondering about university and degrees. One idea I have is that I could do a Theology degree and then do a Law conversion course to become a Barrister. My GCSE grades are A*,A*,A*,A,A,A,B,B,D and some of the subjects were IGCSE. Would this be a good route to take and what other thoughts have you got on the matter?