Disingenuousness, to the max!
There is a system of theology out there called Free Grace theology, which teaches that it doesn't matter how bad a person sins, nor how long. If they believed at least once in their life, they are saved no matter what.
From his opening salvo, it appears that griff believes that faith alone isn't enough for salvation. And it seems to bother him a great deal that God would express His grace in such a way. Apparently, to griff, if one who has believed, later falls away from the faith (which the Scriptures explicitly acknowledge as a possibility), they can't still be saved!! Though he vigorously debates on the side of Calvinism, he sounds much more like an Arminian than a Calvinist here.
The Bible is clear; one is saved WHEN they believe. Jn 5:24 - “Truly, truly, I say to you, he who hears My word, and believes Him who sent Me,
has (present tense) eternal life, and
does not come into judgment, but
has passed out of death into life.
So, apparently, griff takes issue His Lord and Savior. This demonstrates a failure to understand God's grace.
There's no guarantee of sanctification in this system.
Another disingenuous statement. The Bible speaks of sanctification in two senses. Here, he ignores that. There is an ultimate sanctification, whereby each believer receives a resurrection body that is not corrupted by sin.
Yet, here on earth, the thrust of teaching on the Christian life is for each believer to become Christ-like. When one makes such disingenuous statements as seen in the OP, isn't what one would call "Christ-like". He was never disingenuous. He always told the truth.
So, for the life of the believer on earth, the goal is to become more Christ-like, which is to say, to be holy and blameless, which is the purpose of election as stated in Eph 1:4 - just as He chose us (believers, per v.19) in Him before the foundation of the world, that (purpose clause) we would be holy and blameless before Him.
We see this principle of progressive sanctification in Paul's letter to the Galatians, in 4:19 - My children, with whom I am again in labor until Christ is formed in you-
It is clear that Paul didn't think his audience in Galatia had become Christ-like.
For example, little Johnny decided to believe in Jesus when he was eight years old. Little Johnny got bored with Jesus when he turned nine and decided to worship Satan. Now, Johnny is 80 years old, and is a full blown devil worshipper. Johnny loves Satan and wants to be with him. Unfortunately for Johnny, God is not going to give him what he wants. God is going to force Johnny into heaven against his will when he dies because of that one time when he believed when he was eight. I guess Johnny will get what he wants after all, since heaven will actually be hell for him since he hates God and loves Satan.
Sadly, this is just an emotional pitch designed for shock value to make the teaching of the Word of God out to be horrible.
The fact that it is totally by grace that griff himself will enter heaven should help him realize that regardless of how one of God's children behaves, it is still by grace that they too will enter heaven.
This type of post seems to suggest that when any of God's children, saved by faith, later fall from grace or faith, that they no longer deserve heaven.
Does griff deserve heaven? Of course not. No believer deserves heaven.
But griff seems to be pushing a doctrine of loss of salvation here. Apparently he doesn't believe that once God saves a person by GRACE through FAITH, that person is secure in God's power. If that child of God later rebels, God just cuts him off, per the reasoning from griff.
So, where in Scripture does griff get this from? He provides no evidence or support for his view, which he is free to espouse.
otoh, there are many verses that clearly indicate that believers can continue to behave badly, and the doctrine of the "sin unto death" in 1 Jn 5:16 is evidence enough that believers who continue in a life of sin may face the ultimate discipline; removal from earth and forfeiture of eternal rewards.
1 Jn 5:16 - If anyone sees his brother committing a sin not leading to death, he shall ask and God will for him give life to those who commit sin not leading to death. There is a sin leading to death; I do not say that he should make request for this.
2 Jn 8 - Watch yourselves, that you do not lose what we have accomplished, but
that you may receive a full reward.
We see evidence for the sin unto death in the explanation by Paul in 1 Cor 11:30 - For this reason many among you are weak and sick, and a number sleep. We know the word for "sleep" is a euphemism for physical death.
We also see evidence for the sin unto death in the previous chapter, the Exodus Generation. 10:5 - Nevertheless, with most of them God was not well-pleased; for they were laid low (physical death of entire 1st generation except Joshua and Caleb) in the wilderness.
Then, what does Paul say? v.6 - Now these things happened as examples for us, so that we would not crave evil things as they also craved.
And he repeats it in v.11 - Now these things happened to them as an example, and they were written for our instruction, upon whom the ends of the ages have come.
So, the death of the entire 1st generation of Jews out of Egypt during the 40 year wanderings is an example to us, that being believers.
How can anyone believe that unbelievers can be "an example" for believers? That would be like comparing apples and oranges.
The point in ch 10 was Israel's lack of continuing faith in God to provide for them, and Paul makes very clear in v.3-4 that they were believers:
"3 and all ate the same spiritual food; 4 and all drank the same spiritual drink, for they were drinking from a spiritual rock which followed them; and the rock was Christ."
What is clear is that rebelling believers may face the sin unto death, or maximum divine discipline.
But it seems that griff is unaware of any of this. And he clearly believes that faith alone is not what really saves. A believer must persevere in order to stay saved.
None of which is found in Scripture.