If you want to be saved you must believe that Jesus died for everyone on earth's sins. Jesus is our Christ and the son of God. Then you must admit that you're a sinner. "For all have sinned and fall short of the glory of God." Romans 3:23 Jesus is the ONLY way to be saved.
On the third day Jesus rose from the dead. This is why Christians celebrate his resurrection. Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me.
Jesus' last words before dying were, "It is finished" John 19:30 This is a sign that this is all we need to go to heaven and be saved and that we don't need to earn our way. For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. Ephesians 2:8-9
Jesus had the power to come down from the cross, but he didn't because he loves us. "For God so loved the world,[a] that he gave his only Son, that whoever believes in him should not perish but have eternal life. John 3:16