"Christ Killer" is among the most hateful and inflammatory terms on earth, and has often been used to incite hatred of Jews. There is, however, only one religion (actually a primitive and violent death cult whose members claim to be Muslims while they kill real Muslims for being, for example, Sunnis or Shiites) on earth today that would gladly nail Jesus to a cross where he available. Jihadists crucify Christians in the Sudan, and now propose to execute converts to Christianity in Iran. I recommend that we call them "Jihadist Christ Killers" or "Christ-Killing Jihadists" and explain this terminology with the question, "This is what they do to Jesus' followers, so what do you think they would do to Jesus?"
Use this terminology as frequently as possible in conjunction with jihadist atrocities against Christians.