While it is impossible for me to know, I suspect that Mr. Gerencser is a man who came to a particular realization prior to hearing those words “I never knew you.” The reason I say this is he presents himself as being indoctrinated rather than converted into the faith. I appreciate his honesty here because I believe it a legitimate issue in how we work with those "born into the church."
As Christians we are, I believe, told to take the man at his words. We judge the fruit, not the heart, and are to treat him as if he is as lost as his profession indicates. We are fruit inspectors - not botanists.