Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
ii. “To Paul, Adam was more than a historical individual, the first man; he was also what his name means in Hebrew—‘humanity.’ The whole of humanity is viewed as having existed at first in Adam.” (Bruce)1
1 Guzik, D. (2013). Romans (Ro 5:12). Santa Barbara, CA: David Guzik.