1 John 5:10 (NASB) The one who believes in the Son of God has the testimony in himself; the one who does not believe God has made Him a liar, because he has not believed in the testimony that God has given concerning His Son.
1+1=2
1 who has not believed.
1 who believes
which one is the hypothetical exbeliever you speak of?
I speak of those who believe for a while, in which they were a believer, then returned to unbelief, and unbelieving.
13 But the ones on the rock are those who, when they hear, receive the word with joy; and these have no root, who believe for a while and in time of temptation fall away. Luke 8:13
Those who believe for a while then later unbelief sets in because of the deceitfulness of sin, and they depart from Christ, the living God.
Unbelief that comes in after you believe, and causes you to depart from Christ, the living God.
12 Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; 13 but exhort one another daily, while it is called “Today,” lest any of you be hardened through the deceitfulness of sin. 14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end, 15 while it is said:
“Today, if you will hear His voice, do not harden your hearts as in the rebellion.”
16 For who, having heard, rebelled? Indeed, was it not all who came out of Egypt, led by Moses? 17 Now with whom was He angry forty years? Was it not with those who sinned, whose corpses fell in the wilderness? 18 And to whom did He swear that they would not enter His rest, but to those who did not obey? 19 So we see that they could not enter in because of unbelief. Hebrews 3;12-19
- So we see that they could not enter in because of unbelief.
Not unbelief as in never believed, like you claim, but unbelief as in believed for a while, then later turned away in unbelief.
JLB