Theology, Religion, and Philosophy of Religion
The Theology Tripos is possibly the most varied arts course available at undergraduate level - at least, that's been my impression. There is huge flexibility from the very beginning: the only compulsory papers in the first year are a language (there's a choice of four) and either the Old or New Testament paper.
Other than that, it's possible to tailor your study to suit your interests. I opted for the church history paper and Christian doctrine in my first year. This year, I've carried on with Hebrew and Old Testament...