The Role of Judas - A Question Why is Judas condemned since it was his betrayal which enabled Christ to be sacrificed for our sins? I thought there'd be some more ambiguity about how his character is received, given this fact.

I'm an atheist, my personal experience with religion outside of a fondness for Kierkegaard and Levinas is being educated in an anglican school. So forgive me if this is a naive question. 

I'm interested in responses and any thinkers who might provide insight. I'm drawn to but at the same time resistant to being religious, but it fascinates me. 