A Christian is a person that is born from above. He has received a new life from God and is a new creation. God's Spirit is now living in the one that is born of God.
Characteristics of those that are born again. (New Creations).
17 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. 6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. 7 Marvel not that I said unto thee, Ye must be born again.