Romans 8 is another reason to believe that Paul means what he says in Romans 2 – that eternal life is granted based on the good works manifested in the life of the believer.
In Romans 8, Paul writes this:
Therefore there is now no condemnation for those who are in Christ Jesus.
Why is there no condemnation, that is why can those “in Christ Jesus” expect eternal life? Paul goes on immediately to tell us why. Note all the “for”s here – they serve the same function here as the word “because”:
For (D)the law of the Spirit of life in (E)Christ Jesus (F)has set you free from the law of sin and of death. 3For what the Law could not do, weak as it was through the flesh, God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh,
4so that the (J)requirement of the Law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.
Why is there no condemnation?” Because (for) we have been set free from slavery to sin so that……what?
So that we can walk according to the Spirit – do good works as the Spirit enables us.
That is why there is no condemnation – we are enabled to walk according to the Spirit. Notice that Paul did not say “there is no condemnation because you have mentally assented to the proposition that Jesus is Lord and has died for your sins”.
The following verses are not conditions.
They are qualifiers.
For example the entire verse in the KJV reads this way:
Romans 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
"Who walk not after the flesh but after the Spirit."
That phrase, misunderstood by many, is not a condition. It qualifies the walk of the believer. That means that the one who is saved, the one to whom there is no condemnation
will walk after the Spirit and not according to the flesh. The Greek gives a definite sense that the phrase qualifies the first part of the verse; not puts it as a condition.
The same is true with the verses you quoted. Paul is demonstrating what the believer's life is like compared to the unbeliever's life.
Read on:
Romans 8:7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
--This is not the life of a believer. '
Romans 8:9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
--This is not the life of a believer.
These verses strengthen the case for eternal security, not weaken it.
What Paul says here is precisely what we need to know to make sense of what he has said in Romans 2, where he said, clearly, that eternal life goes to those who do good.
That is not what he was saying. He was speaking to the Jews in general. The Jews who did not do good were those who did not believe. Doing good was believing by faith.