Standing at the crossroad of unbelief and belief (still on the fence) after receiving the knowledge of the truth but then choosing to willfully sin/draw back to perdition instead of choosing to believe to the saving of the soul (Hebrews 10:39) does not mean they were saved and lost salvation.Yes, and 15 other Scriptures indicate that the primary sin manifested by outward sins is repudiating saving faith in Jesus as Lord.
These verses below should be discussed one at a time aside from carpet bombing. I will start out by briefly covering some of them. We can discuss them more in depth if you like.
Conditional confirmation of those who are saved.Matt. 10:22, “All men will hate you because of me, but he who stands firm to the end will be saved.”
Romans 11 is primarily discussing collective ecclesiology (the nature and composition of God's covenant people) rather than individual soteriology.Rom. 11:22, “Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off.”
To believe in vain is to believe without cause or without effect, to no purpose. The people who fail to hold fast to the word (the gospel) that Paul preached demonstrated that they "believed in vain" (did not truly believe in the first place).1Cor. 15:2, “By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.”
The present tense of the word "justified" implies that these Galatians were contemplating justification by the law. They were getting sidetracked by legalistic teachers. "You who are trying to be justified by the law have fallen away from grace," but had they fully come to that place yet? Galatians 3:3 reads: Are you so foolish? Having begun in the Spirit, are you now being made perfect by the flesh? The middle voice implies "making yourselves perfect" by means of self-effort. The present tense indicates that the action is in progress and that there is still time to correct the error.Gal. 5:4, “You who are trying to be justified by law have been alienated from Christ; you have fallen away from grace.”
I see the "if" here serving as a conditional confirmation. Continuing in the faith is evidence that one's reconciliation was genuine from the start. Failing to continue demonstrates otherwise. Those who continue in the faith confirm they are genuine believers. But those who do not continue show that their shallow, spurious belief was not firmly grounded and established in the gospel to begin with. Just like in 1 Corinthians 15:1-2, believed in vain.Col. 1:22-23, “But now he has reconciled you by Christ’s physical body through death to present you holy in his sight, without blemish and free from accusation—if you continue in your faith, established and firm, not moved from the hope held out in the gospel.”
It makes sense that Paul would speak this way because he is addressing groups of people who all "profess" to be Christians without being able to infallibly know the actual state of every person's heart. How can Paul avoid giving them false assurance of salvation here when in fact some of them may not be saved?