sigh. If you are going to continue to impugn Christian faith then try to understand that Scripture must be the definitive source for what a Christian is and for what faith is, and actually obtain some education by it, and not by reading a few verses in isolation.
Which word simply does not teach that merely believing that Christ the Son of God is real makes one a Christian anymore then my belief in the devil being real makes me a Satanist. Perhaps you may have even read Thou believest that there is one God; thou doest well: the devils also believe, and tremble. But wilt thou know, O vain man, that faith without works is dead? (James 2:19,20)
Instead of mere intellectual acknowledgment of facts being Biblical saving faith, in Scripture this is abundantly described as that which effects obedience, for in reality, everything you choose to do is a result of what you truly believe, even if only at the moment. Thus faith is equated with obedience by the Spirit.
But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you. Being then made free from sin, ye became the servants of righteousness. (Romans 6:17-18)
Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. For as many as are led by the Spirit of God, they are the sons of God. (Romans 8:12-14)
For while it is faith that is counted for righteousness, faith is evidenced by works, and are the credentials of a Christian, including repentance when convicted in heart of not obeying God.
But, beloved, we are persuaded better things of you, and things that accompany salvation, though we thus speak. For God is not unrighteous to forget your work and labour of love, which ye have shewed toward his name, in that ye have ministered to the saints, and do minister. (Hebrews 6:9-10)
Thus while affirming the salvation of those who believe, the same are told that,
For this ye know, that no whoremonger, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God. (Ephesians 5:5)
But if any provide not for his own, and specially for those of his own house, he hath denied the faith, and is worse than an infidel. (1 Timothy 5:8)
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. (Hebrews 3:12)
Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him. But we are not of them who draw back unto perdition; but of them that believe to the saving of the soul. (Hebrews 10:38-39)
if we would judge ourselves, we should not be judged. But when we are judged, we are chastened of the Lord, that we should not be condemned with the world. (1 Corinthians 11:31-32)
Now its time for some sleep.