Giving His life means he willingly took on the punishment of sin and separation from the Father. He did not fear the crucifixion and death, the real punishment is separation from God. He went through it so we don't have to, because of His love for us. The resurrection shows us two things: 1) Jesus has the power of life and death and the authority to forgive sin, 2) God has accepted the sacrifice as complete and total payment of the penalty. Jesus took every step for us but doesn't force us to believe. Asking Jesus to be your Savior means you accept His payment for your sin. Rejecting His payment means you will pay your own penalty, and that is eternal separation from God, the worst thing ever. We were never meant to be apart from Him.