The evil is the fact that many "christians" insist that not only that their specific beliefs are the only way to get to god, but those people who 'Do not accept christ's blood for the remission of their sins" go to hell forever. This causes them to be arrogant, obnouxious, and treat other people as second class citizens. That is the evil
Before someone could blame Jesus, they first would have to demonstrate that the historical Jesus actually existed. Before the second Jewish revolt , there was no non-scriptural evidence this person existed. Come to think of it, many if not most of the gospels were written after the second Jewish revolt.