Actually, that’s Tubal-Cain, the bad guy of the film, the meat-eating, gun-toting, property taking, murderous scum; and note he has Satan’s shed snakeskin on him.
"This was a thoroughly pagan retelling of the Noah story direct from Kabbalist and Gnostic sources," Mattson writes.
Mattson reminds that the "subject matter" of Arnofosky's debut film, "Pi," was Kabbalah, so it makes sense that he was already familiar with it. Moreover, a number of moments in the film that at first seemed like artistic flourishes -- a glowing Adam and Eve, the serpent skin Noah wraps around his arm -- all have a basis in either Kabbalah or Gnosticism:
The world of Gnostic mysticism is bewildering with a myriad of varieties. But, generally speaking, they hold in common that the serpent is Sophia, Mother, or Wisdom. The serpent represents the true divine, and the claims of The Creator are false.