Everyone who believes the gospel is a Christian. KJV 1 Corinthians 15:3-4 3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 4 And that he was buried, and that he rose again the third day according to the scriptures. All Christians are members of the body of Christ. KJV Romans 12:5 So we, being many, are one body in Christ, and every one members one of another. The church is commanded to teach, preach and observe the scriptures. KJV Matthew 28:18-20 18 And Jesus came, and spoke to them, saying, All power is given to me in heaven and upon earth. 19 Go ye therefore and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit. 20 Teaching them to observe all things whatever I have commanded you: and lo, I am with you always, even to the end of the world. Amen KJV 2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: KJV John 7:38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.