I agree that it is unfair for a question to demand multiple POV answers, that doesn't make multiple POV answers a bad thing in themselves. In many cases I think answering with multiple POVs is not only acceptable but beneficial. If you have studied a topic and are qualified to make a statement about how other people view something, adding that as balance to an answer is a good thing.
On the other hand, the inclusion of multiple POVs should not be the only measure of a good answer. Some questions will solicit answers from multiple quarters and it is OK to have more than one good answer to a question with each presenting a single view.
Whether answering from a single or multiple point of view, clearly identifying the espoused view is critical to keep the votes from being a popularity content. If I see an answer that says "X" and I think "X" does not represent Christianity I would down-vote it. If I saw an answer that says "Such and such a group believes X" I might upvote it as a good answer even if I think such and such a group isn't even Christian.