God is generally accepted as a supreme being by relatively everybody, probably except the atheist only. However, the relationship or difference between God and Jesus Christ is still a topic people argue or debate on till this moment. Many proclaim that Jesus Christ is God, while still, many disagree.
Whichever way, I would be writing on this topic majorly from the Christians' point of view, or better still, according to the Bible. Jesus referred to himself as a Son of God, which the Jews have issues with from the time He came to the earth, and some are still fighting that in their head up till now.
Though I feel religion is not something of the head, but of the heart. However, the Christian scholars explained to us that the term "Son of God" does not really mean God "giving birth" to a son, but it means God in form of man. And this is where I will strike my difference.
God is a Spirit, according to the Bible, and He cannot die in His form; because a spirit doesn't die. So, he had to come in another form in flesh, but still Him. And this form is Jesus Christ; who, only, died for the sins of the whole world.