Defining a "Christian"

"Paul of Tarsus. "That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved."  This divides the human race into two groups: those who will be saved and ...those who are not saved .... This criteria, based on the belief in the resurrection of Jesus, has been frequently used to define who is a Christian." RT