Over the last few months, I have emailed Christian philosophers and have asked them at what point
does "Christian philosophy" become "not Christian". I have been amazed at how reluctant they are to answer my question. Most just didn't respond. One or two responded with sarcasm. Alvin Plantinga, however,
did respond [briefly] and said that if someone denied the resurrection as part of his "philosophy", then that philosopher was not doing Christian philosophy. Plantinga was answering an example I gave him in order to encourage a response. I sent a followup to him, but he never responded. Strange.