Does not invalidate Romans 8 though. Enmity prevents reconciliationExplain this then...
1 Corinthians 3:1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. 2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able. 3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
How were these people that Paul rebuked "in Christ" if the carnal mind cannot believe in Christ? You are interpreting Romans 8 in such a way that contradicts 1 Corinthians 3. You are not being careful with how you are interpreting scripture. You can't interpret any passage in isolation from the rest of scripture without making sure you are not contradicting any other scripture.
There are different kinds of carnality being spoken of by Paul. For saved carnal Christians, they are living to much indulgence in the flesh and not their spirit, but they do not have this enmity in their mind against God.
While the unsaved carnal mind has this enmity against God. That is the difference.
7 Because the [c]carnal mind is enmity against God; for it is not subject to the law of God, nor indeed can be.
IF they cannot be submitted to the Law of God, then they won't be hearing God speak telling them to repent.
Like Jesus said in John 8, they do not listen, as they are not able to listen.
43 Why do you not understand My speech? Because you are not able to listen to My word. 44 You are of your father the devil, and the desires of your father you want to do.
Where else do read of enmity, which is extreme dislike and hatred even?
Genesis 3
14 So the Lord God said to the serpent:
“Because you have done this,
You are cursed more than all cattle,
And more than every beast of the field;
On your belly you shall go,
And you shall eat dust
All the days of your life.
15 And I will put enmity
Between you and the woman,
And between your seed and her Seed;
He shall bruise your head,
And you shall bruise His heel.”