What did Jesus say His mission here was and why He was to die on the cross?
There is some question among religious historians as to whether Jesus died on a cross or a single upright stake of wood in the ground.
Jesus preached "love your neighbor as yourself" and "love God with your whole heart" and said all of the Mosaic Law was summed up by these. He was here to end the special relationship Jews had with Yaweh and said he, himself, was the way, the truth, and the life. In other words, he said he was here to die for mankind's sins.
I may not agree with Jesus' words 100% but he certainly had a much better philosophy about how humans should treat one another than most Republican "Christians" do today.