Callous Christians = Wolves-in-sheeps'-clothing

A person can fall from  being  a real Christian  to a fake Christian  while still claiming to be a christian, attending church, witnessing about Jesus, etc.  He just quietly stops being a Doer of the Word and becomes just a Hearer only, deceiving himself, an idle talker, not a true servant of Christ.

Real Christian

Fake Christian
Circumcised in heart, sensitive, considerate, compassionate,  sympathetic, kind,  gentle  Uncircumcised in heart, insensitive, callous, hard-hearted
Doer of the Word Hearer of the Word , but not a faithful  Doer of the Word