Why is the resurrection of Christ so important?

Thanks for your question. No answer to this question will ever be complete this side of Heaven. The truth of the resurrection was witnessed by over 500 individuals (1 Cor. 15:6). Imagine over 500 witnesses taking the stand in a court of law and stating, "Jesus is Risen, He has risen indeed. I saw Him after his unjust crucifixion? He's alive." What verdict would a just jury give?

What was and still is being accomplished by Christ's resurrection is far beyond mere words. This said, here are some brief highlights:

1. It proved that Jesus is the Son of God (Rom. 1:4).

2. It proved the love of God (Gal. 2:20).

3. It proved the truthfulness of God, as Christ was raised the third day according to the Scriptures (Psa. 16:10-11; Isa. 53:10-12; Acts 17:2-3; 1 Cor. 15:3-4).

4. It proved the truthfulness of Christ's very words, that He would be raised on the third day (Mark 8:31; 9:31; 10:34).

5. It proved the power of God, Christ, and the Holy Spirit (Phil. 3:10; cf. Acts 2:24; John 2:19; Rom. 8:11).

6. It authenticated Christ's victory over death, therefore displaying His absolute sovereignty over life and death (Rom. 6:9; 1 Cor. 15:54-55; Heb. 10:12).

7. It authenticated Christ's ministry as the savior of His people (Matt. 1:21).

8. It authenticated Christ's sinlessness (Psa. 16:10; Acts 13:32-37).

9. It united Christ to His people (2 Cor. 4:14; cf. 1 Cor. 1:30).

10. It provided the justification of Christ's people (Rom. 4:25).

11. It provided the Christian's living hope, as without the resurrection our faith would be "useless" (1 Cor. 15:14-19; 1 Pet. 1:3-4).

12. It provided the Christian's source of life - eternal life (John 11:25; 1 John 5:11-12).

13. It provides life "now" (1 Cor. 15:58).

14. It provides the very outpouring of His Spirit to all His people (Acts 2:33).

15. It provides power now for the Christian to overcome all adversity (1 Cor. 15:30-32).

16. It provides for the final resurrection of all Christ's children (Hos. 13:14; 1 Cor. 15:20-22, 42-44, 55; 1 Thess. 4:13-18).

17. It means that Christ will judge the world in righteousness (Acts 17:30-31).

These are just a few of the numerous truths of the resurrection. I must pose a question at this point. Jesus said, "I am the resurrection and the life. Whoever believes in me, though he die, yet shall he live, and everyone who lives and believes in me shall never die. Do you believe this?" (John 11:25-26). Do you believe this? May God grant His mercy and grace to you that you may believe in the resurrection of God's only begotten Son from the dead.