Ahhh, how very true. You "hit the nail on the head", so to speak. Most of the Scriptural quotations used by our non-Catholic friends are generally totally out of context. That is another issue with thise type of "sola scriptura" approach to faith, that each reader seems to think each verse means something in and of itself particular to that readers' expectations. A rather unsound foundation to build a theology around, in the opinion of the Church.
So as regards theology, I have a generally good view of it. On the whole it generates good people who want to do good in the world, and generally what they think of as good, I agree with. But sometimes, there is some particular quote somewhere that forbids or allows some thing that disagrees with what I know to be right.
An example would be the homosexual rights issues. I am pretty sure that it doesn't explicitly state that all homosexuality is wrong, but there are a lot of people who say just that. Also the teaching of creation might not be a big issue in Canada where Catholics are dominant, but south of the border it causes a hay-day.