Take a look at what judaism.stackexchange does.
Similar to our site, I bet they were getting inundated with "advice" questions and finally put this disclaimer up there with helpful links. Why don't we do that?
I like the idea. It doesn't seem to prevent other notices, like community ads, from appearing in the sidebar; rather it just shifts everything down a bit.
Let me suggest that we use the following wording, adapted from Judaism.SE's example and Jon Ericson's relevant post:
Like any library, Christianity Stack Exchange offers great information, but does not offer personalized advice, and does not take the place of seeking such advice from your pastor, priest, or other trustworthy counselor.
Feedback and edits welcome.