The Fallen One is a tragic tale. For he was Blessed by the Sanguine Lord with great ability to offer his foes. Sadly, when he was himself offered by the Eater of Pasta in a test of his faith, he began to waiver. Upon gaining the Throne of Welters and despite further Blessings (his brutal offerings of the Country Boy, the Eater of Pasta, and Brother Penn, Consumer of Blood) he became obsessed with holding the Throne at all costs and forsook the One who had enabled him to do so.
In conclusion, he was Sacrificed, and that in itself was no sin, it was his reaction to it that lead to his fall from grace.