Jesus Christ, God's Son came to earth as a man to suffer the penalty for sin in our place: Death. So that we can know God now, and spend eternity with Him, avoiding the penalty of eternal punishment in the place the Bible calls hell...
For God so loved the world that He gave His only Son so that all who
believe in Him should not perish but have eternal life
The Bible: John 3:16 - NKJV
Of course ... He didn't stay dead ...
That if you confess with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved.The Bible: Romans 10:9 - NKJV