I mean just what the apostle Paul meant by it.
Romans 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
So Paul was wrong?
Of course. So how does a dead person do something to be saved? "Believe" is a verb. Something you do. "Exercise" faith is a verb, something you do. How does a dead person "do" something?
1 Corinthians 2:14 But the natural man (spiritually dead, as you correctly said, above) receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
Not only can't he do something, he can't even know what to do.
Salvation is by the Grace of Almighty God, by the Sacrifice of Christ for us, not by anything we do.
No Paul was not wrong. Salvation frees us from sin and death. The natural can't understand Spiritual teaching deep doctrinal teaching, it is foolishness to them. Doesn't mean they can't respond to the drawing of the Spirit to salvation. They can't understand for instance sanctification, nor can they understand how salvation is by Grace through, but they can respond when drawn byt he Spirit and they can accept the Lord or reject Him. The Law of the Spirit of Life is that we must believe on the Son for salvation which frees us from the Law of Sin and Death. But that goes back tot he point of this thread where "thelō" one must use the God Divine Gift of volition to make a conscious choice to receive Christ as savior. Not to believe and call (Romans 10:13) means no salvation.