Anyone whom prays to God the father, God of Abraham, Isaac and Jacob, whom believes that they are saved by the blood of Jesus Christ and attempts to the best of their ability to follow the 10 Commandments, and repent when ever they fail to keep the 10 Commandments or slip in their faith are Christians.
Doctrine does not make you a christian, but a denomination.
We are the body of Christ, and as a body has many parts, so to do each true doctrine,
based on the word of God with in context of the whole word, has its part with in the body.
John 3 verse 5 to 7 King James Bible (Gospel)
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. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. Marvel not that I said unto thee, Ye must be born again.
John 3 verse 16 to 18 King James Bible (Gospel)
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. For God sent not his Son into the world to condemn the world; but that the world through him might be saved. He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
1 John 5 verse 1 to 8 (Apostle teaching)
Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him. By this we know that we love the children of God, when we love God, and keep his commandments. For this is the love of God, that we keep his commandments: and his commandments are not grievous. For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.