Yes, I agree with you that God has never been dead. But, Jesus, in His humanity did die and was dead. You have to remember that Jesus took on the form of a man. He was still God the whole time. He is the second person of the Trinity. There is a lot more to Jesus than just taking on the form of a man. It was that form of a man part of Jesus that died. God could never die. This all remains somewhat of a mystery and we probably will not understand it until eternity.