One of the basic tenets of Christianity is that Jesus had to go to the cross to atone for our sins. Doesn't that make all of us Christ-killers?
Died he for me? Who caused his pain!
For me? Who him to death pursued?
Amazing love! How can it be
That thou, my God, shouldst die for me?
Charles Wesley, 1739
There's an important distinction to make. Stating that Jesus 'had' to go to the cross to atone for our sins or referring to us as 'Christ-killers' implies that Jesus had no choice but to go to the cross or that we took His life from Him. Not so--nobody took His life from Him. He laid it down of His own free will. He freely chose to lay down His life to pay the price for our sins. He did all the work, and it is finished. All we have to do is accept or reject it--on His terms, not ours.