The Biblicist said:
Your position requres a THIRD kind of man who is neither "in the flesh" or "in the Spirit" which "IS" not being described in Romans 8:7-8. No such man exists.
But you are wrong and another type of man does exist, the unregenerate, but devout or spiritual man. Cornelius was such a man;
Acts 2:1 There was a certain man in Caesarea called Cornelius, a centurion of the band called the Italian band,
2 A devout man, and one that feared God with all his house, which gave much alms to the people, and prayed to God alway.
We know from scripture that Cornelius was not saved at this point in time, and he did not have the indwelling Spirit, yet the scriptures do not call him either a "natural" or "carnal" man, but a "devout man" who feared God, prayed always, and did many truly righteous works.
We see another example of "devout men" in Acts chapter 2;
Acts 2:5 And there were dwelling at Jerusalem Jews,
devout men, out of every nation under heaven.
These Jews were not saved, neither did they have the indwelling Holy Spirit, yet they were all in Jerusalem to worship God and celebrate the Passover. And we know that over 3000 of these men and women trusted Jesus Christ that day and received the Holy Spirit.
Another example is the disciples themselves in Matthew 26:41;
Mat 26:41 Watch and pray, that ye enter not into temptation:
the spirit indeed is willing, but the flesh is weak.
The disciples had not received the indwelling Holy Spirit at this point, but Jesus said in their natural spirit they were indeed willing to obey him, but their flesh was weak and caused them to fall asleep.
This shows that unregenerate man is not solely flesh, but also spirit, and that in his natural spirit he can be willing to be obedient and believe in God.
Cornelius and those thousands of unregenerate Jews on the day of Pentacost also show that natural man can attend to spiritual matters if they so choose to do.
Your theory is EASILY refuted by scripture.