It cannot be Saruman because he represents a fallen angel, just like Gandalf represents a good angel.

I think Boromir is correct for Judas. In the original language, Judas was called Yehuda.

Like an apostle (sent on a mission), Boromir was chosen to be in the small company of Aragorn (Yeshua). Boromir's family (Yehuda) held stewardship over Gondor (Israel). Boromir wanted to seize the ring (Judas held the purse, and sold out in the end for 30 pieces of silver), and though Boromir repented (as Judas did) he still died cruelly by wooden arrows (Judas suicide on a tree).

Faramir, the brother of Boromir (Yehuda), valiantly accepted Aragorn (Yeshua) as the rightful king of Gondor. Faramir's father Denethor (representing the greater tribe ruling Yehuda) rejected Aragorn as king. Indeed, this makes Denethor like Herod.