It's the problem of all of us if a person says he is a Christian and then believes doctrine that is not Christian.
I don't believe we can call ourselves Christian unless we believe in Christian doctrine. I don't mean that we're going to agree on every topic, but we have to have the basics down, as Jesus, Paul and the other writers meant us to have.
If this is not the case, then Christianity is lost. If we can believe what we want to and still be called Christian, then Christianity has lost all identity and it has been washed away and no longer exists.
GodsGrace:
(2Co 13:5) Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test! (ESV)
(Rom 8:9) You, however, are not in the flesh but in the Spirit, if in fact the Spirit of God dwells in you. Anyone who does not have the Spirit of Christ does not belong to him.
(1Co 2:11) For who knows a person's thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God.
(1Co 2:12) Now we have received not the spirit of the world, but the Spirit who (that) is from God, that we might understand the things freely given us by God.
A believer in Christ has to first have Christ's spirit
inside him/her to understand spiritual things of God. Teachings and doctrines flows from this....this is a Christian.
APAK