For me, I think the fine line is when the therapist tries to impose thier own belief system on the client. Calling yourself a Christian counselor I don't think justifies using the therapy hour to save souls. Nor does it make it okay to use the Bible to moralize or otherwise scare a client into following recommendations of any sort. I would like to think that Christian counseling is about being supportive of a client's need to refer to the Bible, but allowing the client to take the lead, such as selecting passages or coming up with their own interpretations. IN that case, I'm having a hard time understanding how Christian counseling would differ from any mainstream counseling.