Church is to theology as Reader's Digest is to literature. In these modern times, few people have time to study scripture and other religions readings in great depth, and even if they did, they don't necessarily have the training to understand them. (Yes, it does take training). The fact that for most people, church just means a couple of hours out of every Sunday is a comment on how far religion has fallen as an important part of life for some people. It used to be that sabbath was an all-day affair (and it still is for many Orthodox Jews), but with the advent of so much modern "entertainment", it cannot compete.
So these days, a lot of church worship is distilled to an hour's worth of sound bites that give you some platitudes, summarize some scripture, a few nice tunes (my church always had exactly three hymns, except at Christmas and Easter). The minister/pastor/priest is expected to do the heavy theological lifting and then impart his wisdom to the masses.
Yes, there are lots of social reasons to go to church as well, but as for teaching, churches have become less like schools and more like FAQ sheets.