Jesus lived as a human to show us how to live as humans and He did it perfectly, which we cannot. Because Jesus is God (one of three forms, think water, ice, vapor for lack of a better understanding) He knows we can't be perfect so in order to regain access to us and thereby give us access to Him, He died. When He died He overcame death, that is defeated it by dying our death, a death He needn't die because He is eternal, this is how Jesus gained victory over death and hell(He took the keys per se). We are more than flesh, we are creatures made with the creator's spirit, His image as it were. When Jesus died His real spirit form went into darkness for us and took power over those that challenged God's sovereignty and started the battle for our everlasting souls, as always, God wins. Then He rose to life to share His victory with us and give us the gift of eternal life in the Kingdom of God. He loves you so much and He wants to know you forever. Gifts are freely given but they do require acceptance from the receiver.