I am an atheist who has been befriended by a very devout Christian (read: an ex-missionary). I often find that our philosophical differences prevent me from expressing myself the way I would like. However, this friend has been very devoted to pursuing a deeper friendship with me despite my attempts to keep the relationship very casual. She calls me her "best friend" to others and goes out of her way to forge a deeper bond by regularly telling me how "special" I am to her and reiterating how close to me she feels. She will often say that she regards me as a "sister." I am puzzled by her persistence, given that she has so many friendship options within her Church and the rest of the Christian community. I am also increasingly uncomfortable with our interactions, given their necessarily narrow breadth and depth: we tend to focus our discussions mainly on a shared hobby we enjoy that has nothing to do with religion or philosophy. I really value time spent engaging in philosophical discussions with my other friends, and this is simply not possible with her. The dilemma is that she has been admirably non-judgmental toward my lifestyle, at least outwardly. She does not proselytize or try to "convert" me. (I have made it clear to her that this is not possible.) Still, our friendship feels vacant to me. I have tried to express my concerns to her at various times but her response is always that she loves me and accepts me "no matter what." I think she is being sincere, but it feels like a manipulation or, at least, an evasion of our many differences. Still, I always end up feeling guilty for keeping her at a distance while she works so hard to be my friend. Should I end this friendship once and for all?