I did a bit of theology at school for the Religious Knowledge 'O' level. But a lot of it seemed like pointless, overcomplicated gobbledegook - I think the world could manage very well without the concept of Logos Spermatikos for example. We only covered 2 books - John and one of the others, I forget which. The teacher was pretty light on expecting anybody to believe any of it, and had mainly a scholarly approach to the whole thing. So we were doing things like comparing the different literary styles of the authors.
Naturally as a secular man I'm wary of theology because it seems silly to study something that doesn't exist, especially when it gets so complex and obscure. But it's sometimes interesting to fathom the ideas that underpinned the thinking of the religious egg-heads, even though at the end of the day I see it as a load of bunk.