All these things you use need to be understood in light of the fact that there are conditions for Christians to meet, like not walking according to the flesh, that if they do not meet, they will die the second death. This is not hard to reconcile. What is hard to reconcile is trying to come at these things with the presupposition that OSAS and Faith Alone are true and then reading that into these things and actually thinking it is convincing.
Notice when Paul "us, who do not walk according to the flesh but according to the Spirit," he never stopped talking to the same "us," when he said, "if you live according to the flesh you will die."
What a bunch of horse manure...really.
Paul clearly stated and defined what a believer was in Romans 8. The Spirit of Christ dwells in the believer. (vs 9)
Notice Paul says "if" and not "as long as". This clearly defines two conditions and only two conditions...believer and non-believer. Believer has Spirit of God, non-believer does not.
Paul explains in earlier verses what that means. Believers are according to the Spirit and set their mind according to the Spirit. (v5) Believers walk according to the Spirit. (v4)
Not once does Paul use phrases like "while in the Spirit", or give an example of someone who once was in the Spirit but is now in the flesh. Instead every example Paul gives shows two different direction...flesh or Spirit. And every time the flesh is in reference to the unbeliever and the Spirit is the believer.
What Paul says here in Romans is that Christians CAN'T walk in the flesh.
VS 4 "walk according to the Spirit"
VS 5 "but those according to the Spirit, the things of the Spirit"
Paul continues on Romans 8
vs 13 "for if you are living according to the flesh (see above meaning unbelievers), you must die; but if by the Spirit (believers) you are putting to death the deeds of the body, you will live." So if you are a believer you are putting to death the deeds of the body...(see above..walking and the mind).
vs 15 "for you have not received a spirit of slavery leading to fear AGAIN, but you have received a spirit of adoption as sons by which we cry out, 'Abba! Father!'" I want you pay attention to the middle of this verse...I capped it for you. While unbelievers we had a spirit of slavery that lead to fear. Paul says we have not received that spirit AGAIN...instead being saved gives us the spirit of adoption. Paul denies that we can get the spirit of slavery again.
There is no conditionals in Romans 8 except that the Spirit of God must dwell in you. Which is received upon salvation...need me to go into those verses too? Paul talks about there in verse 15 about us being given it. Never once does Paul say that "as long as" in any of his books. Christ never says it, Peter, John, any of the others, never say it.
What they do say, just as Paul spent the entire chapter explaining...a true believer no longer has their mind on the flesh, no longer walks in the flesh, and the core of his message is that they never can again. There is no "light of conditions", that is simply not there in Romans 8, as a matter of fact Romans 8 speaks strongly against conditions.