I seriously doubt saying "I am not comfortable answering this question." would get you an acceptance. I think the best thing to do is answer honestly and accept, consider and discuss any points the interviewer raises with you. They want to see how you think, not whether you are properly indoctrinated, at least that is what I hope they are doing most of the time. If you are worried about being tested for your beliefs and want to tell them what they want to hear, the PC approach is usually the best, though I wouldn't personally answer based on what I think they want to hear.