A Christian must believe that…

The death of Christ was expiatory, not exemplary. He died for all men. His blood is the only atonement for sin and by His stripes we are healed.

Matthew 1:21

21 And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.

Read Isaiah chapter 53.

Matthew 8:17

17 That it might be fulfilled which was spoken by Esaias the prophet, saying, Himself took our infirmities, and bare our sicknesses.

Matthew 26:28

28 For this is my blood of the new testament, which is shed for many for the remission of sins.

John 3:16

16 For God so loved the world that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Acts 4:12

12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.