That's right, God cannot die. Jesus was God incarnate. And you shall call him, Immanuel, which means
God with us. Jesus was God. As he said numerous times in the New Testament.
Judaism is grounded in symbolism, among other things, like allegory, etc...
Jesus appeared as a human, he was born of woman, because God in the beginning created male and female and as such he begat himself upon Mary so as to be born in human form.
This is because we are told humans cannot gaze on the full form of God and survive the encounter. But as a man, who was born into a Jewish family and followed Jewish law, (God's law), Jesus was seen as a man delivering the prophesied testament as Messiah.
When Jesus was seen to die on the cross and was placed in the tomb for three days and three nights, people who witnessed this believed he died just as everyone did who was crucified under Roman law.
When Jesus conquered death and rose from the tomb and walked the earth for forty days, he was the living symbol of his teaching about salvation giving us eternal life, that death can not conquer. And as such, Jesus defeated Satan's hold on death. Because now those who are in Christ do not die, but live eternally with the Father, who was Jesus.
When Jesus returned to heaven and sits now at the right hand of God, in Jewish symbolism that means Jesus is at the right hand of power. The power that made Jesus to be born as fully divine and fully human.
He returned to himself. Jesus was God. God is Jesus.
And just an aside, if you're here with the intention of messing with Christians and aren't actually sincere in learning what you do not know about our faith, you prove to all of us that you do need Jesus.
You may wish to take that seriously because mockery stops when you die. Then you find out the truth. That eternity in darkness is a long time to spend in the ultimate reality of, "we told you so!"