I own the Old Testament set, and like it a good bit. I'm interested in the New Testament set, on sale until the end of today... but I'm a little wary. I'm not Protestant, and I know Zondervan as a publisher. How much Protestant theology is woven into the commentary here on, e.g. Romans? This isn't about me maintaining some kind of theological purity in my reading (I certainly don't), I only want to make sure that if I actually spend the money for this, I'll actually get historical/cultural/archaeological background in the New Testament volumes, not conservative Evangelical theology.