1 John 2:19 They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.
>> Has to be reconciled with this, which suggests a person could have been a true believer and repented of their faith:
Hebrews 6:4-6 (NLT)
4 For it is impossible to bring back to repentance those who were once enlightened—those who have experienced the good things of heaven and shared in the Holy Spirit, 5 who have tasted the goodness of the word of God and the power of the age to come— 6 and who then turn away from God. It is impossible to bring such people back to repentance; by rejecting the Son of God, they themselves are nailing him to the cross once again and holding him up to public shame.
see post 33.
The Hebrews passage refers to the mechanics of Efficacious Grace, also discussed in Eph 1:13.
It is also in response to the First Call. The Call is when God the Father asks a human if they believe in the work of Jesus Christ on the Cross. It occurs per His Plan, at the proper time and place, so the predestined mechanics of making the Gospel available to the human has already occurred.
If after understanding the Gospel, have it been made known spiritually through the work of God the Holy Spirit, and the human denies Christ, he has no other opportunity for salvation.
This is different than somebody who rejects their ‘faith’ after occupying a worldly system of works they identify with the Church.
So the referenced verse in Hebrews pertains to presalvation activity, while the Pastor in the article claims to be a case of postsalvation action.
In post-salvation sin, the answer is the same as in all other cases of sin. All sin was paid for on the Cross. The out of fellowship believer simply returns to God by Facing God, confessing all his known and unknown sins to God, through faith in what Christ provided on the Cross. He is faithful and just to then forgive those sins, and return us back into fellowship with Him. (1Jn1:9)
Regarding losing one’s salvation, the best verse in the Bible is John 3:17. It doesn’t begin with “Except,”.