One of the most difficult challenges I had when first participating with this site was overcoming the urge to be part of a conversation. It took a long time to understand (and a part of me will likely never completely agree with it) that the site's very structure makes discussion-based answers (e.g., "what does everybody think about X?") difficult to manage. They certainly don't fit within the one-question-one-correct-answer format Stack Exchange has created.
Therefore, I propose we add verbiage similar to the following to the "How to Ask" block that appears when people ask a new question. It's purpose would be to decrease the liklihood that a question will be closed, which can result in new partipants not coming back.
Address your question to specific Christian denominations or traditions.
EDIT: @fredsbend makes a good point about not wanting to limit or exclude questions just because they don't need to reference a particular group. Therefore, let me present alternative #1:
When asking about scriptural or dogmatic beliefs, it is best to address your question to specific Christian denominations or traditions.