I see it differently. Consider the opening lines of John 15.
John 15:1-3 I am the true vine, and My Father is the vinedresser. Every branch in Me that does not bear fruit, He takes away; and every branch that bears fruit, He prunes it so that it may bear more fruit. You are already clean because of the word which I have spoken to you.
For many years, my eyes would quickly move beyond the sentence I highlighted, which was unfortunate because it is the key sentence in this passage. To "clean" a vine is to prune it to bear more fruit. Jesus says that the eleven were already "clean" because of the word which he spoke to them. He refers to the promise of the Holy Spirit and his teaching. God the Father has already "pruned" the eleven by giving them his Holy Spirit and the ability to continue Jesus' mission with a firm grasp of the Gospel message. He tells them that the Spirit of truth will be "in them." (John 14:17) He also tells them that they will know that "I am in My Father, and you in Me, and I in you." (John 14:20)
For this reason, we make mistakes when we understand phrases like "he who keeps my commandments" as open-ended conditional statements. Instead, the conditional statements assume a positive result as if Jesus said, "if you keep my commandments . . . (and I know you will because the Father has already cleaned you) . . . " is the one who loves me." Since the Father is performing the pruning and the Eleven have already been pruned, then none of the eleven will fall away, cease keeping his commandments, stop loving Jesus and etc.
No, after David sinned with Bathsheba, he cried "don't take Your Spirit sway", and Paul says the same, "He who disregards this [prohibition on immorality] disregards not man but God Who gives you His spirit".
Clearly, it's a threat that if you don't keep God's Word about immorality, He will stop supplying you with His Spirit.
Same is true in John 15--the branches that don't abide bc they don't keep His Word, are not supplied with the substance within the Vine (the life is in His Son (1 Jn 5:11), "by the Spirit He has given us" (1 Jn 3:23,24)), so they don't bear fruit, and are thrown in the fire.
The condemnation in Romans 14:23 is different from the condemnation in Romans 8:1. In Romans 8:1, Paul declares that those in Christ are free from eternal damnation. In Romans 14:23, Paul means to say that God disapproves of the one who doubts when he eats the meat. He is not suggesting that the one who acts against his conscience will be subject to eternal damnation.
We've come a long way on this one. First, you denied it was a believer at all. You had lots of permutations that were variations on denying the obvious truth of the matter, and now we're here at another denial.
Paul says the believing Jews were "storing up wrath" by their behavior (Ro 2), and that doesn't sound like they're on the "eternal life" side of things.
I see it differently. The conditional statements found in 1 John 1, assume a positive answer. "If we walk in the light . . . and I know you do . . ."
Conditional "IF". "See" it how ever is convenient for your view.
The key to John 15 is Jesus' word concerning those whom Jesus has chosen. If Jesus has chosen a person, the Father cleans that person so he can bear fruit and he will remain in the vine. (John 15:16)
Nowhere does it say that--and the language is used for the "children" in 1 John.
"And now, little children, abide in him, so that when he appears we may have confidence and not shrink from him in shame at his coming. " (1 Jn 2:28).
The disciples are the branches--the children are disciples.
The branches abide by keeping the Word--the disciples abide by keeping the commands (1 Jn 3:23 24).
1 John 2:28 says the one who abides has "confidence", and does not draw back in shame. Who has "confidence" in 1 John? The one who keeps His commands. The language "draw back" is the same as in Hebrews 10:38,39, where "If My righteous one draws back My Soul has no pleasure in him... unto destruction." The branches that don't abide are thrown in the fire--the children will be destroyed if they do not abide (by keeping His commands to believe in the Name of God's Son and love others).
Bottom line : there's no ambiguity about what is being said--your reading is very far off.
The condemnation mentioned in Romans 8 is eternal destruction; the condemnation mentioned in Romans 14 is not.
You've come a LONG way in your views on Romans 14:23, but you're still not there.
"Condemn" is an adjudication of the individual based on the evidence presented--it is the opposite of "justify".
This means that, according to Ro 14:23,
ongoing and
final justifications depend on how we walk--same as is purported in Ro 2:6-16, and James 2, and everywhere else.