Paul was a spiritual man. He said that "we who are alive and remain" So, to Paul's mind there is one body and all of them were one in Christ Jesus. So "we" is those in the body who are alive. It was not even a prophesy, but a teaching. The King David in Ezekiel 37:24 is clearly Jesus.
Paul indeed was a “spiritual man” as indicated by Revelation 16:13-16, for his spirit apparently was that of a demon, such that it was an “unclean spirit”, which is active today according to Revelation 16:13-16. I think you are confusing the “walking dead”, the “many”, who are walking toward “destruction”, with the “few” who found "life", the “narrow” ”way” (Matthew 7:13-14).
As for Ezekiel 37:24, it is with respect to the “stick” of “Judah” and the “stick” of “Israel”, and they will all “keep My statutes” ,”forever” (Ezekiel 37:15-28). Your Gentiles, such as “strangers”, will “attach themselves to the house of Jacob”, as “servants” (Isaiah 14:1-2).