Pastor Greg Laurie defines an Authentic Christian as someone that has done these 5 things:
#1) They have confessed that Jesus Christ is Lord
#2) They are unhappy when they sin
#3) They enjoy fellowship with other believers
#4) They obey the commands of Jesus Christ
#5) They love and obey the Word of God
There are also 3 Tests of Authentic Christianity:
#1) The Test of Belief: Do you believe that Jesus Christ is the Son of God?
#2) The Test of Love: Do you really love one another?
#3) The Test of Obedience: Do you want to keep God’s commands?
John 14:15 “If you love me, keep my commandments”