Unbelief is not simply an infirmity of fallen human nature, it is a heinous crime against God! Scripture everywhere attributes it to love of sin, obstinacy of will, hardness of heart.
Unbelief has its root in a depraved nature; in a mind which is enmity against God.
[A. W. Pink]
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1 John 5:10 ... He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son.
John 3:36 ... He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Mark 16:16 ... He that believeth and is baptized shall be saved; but he that believeth not shall be damned.❤