What makes a person a Christian?

A Christian is someone who realizes that they are a sinner
and chooses to trust Jesus Christ as the substitute for the penalty of their sin.

The Bible tells us of our condition before God—we are sinners. 

“For all have sinned, and come short of the glory of God.”Romans 3:23

There is a penalty for sin.

“For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.”Romans 6:23

Our sin penalty cannot be paid with our own works. 

“For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.”Ephesians 2:8-9

Jesus paid our penalty for sin.

“But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.”Romans 5:8

All we must do is trust in Jesus.

“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.”John 3:16