And what about the genealogies of Luke which traces Christ linage back to Adam?
Luk 3:38 the son of Enos, the son of Seth, the son of Adam, the son of God.
As for Paul, Paul never considered Adam to be a "fictional" character.
1Cr 15:45 Thus it is written, "The first man Adam became a living being"; the last Adam became a life-giving spirit.