First, Christ is He Whom He claimed to be. He is the Son of God, your Savior and Lord. You have no other Savior. You have no other way to eternal salvation, except through Christ. The power of God, seen through the resurrection, corroborates Christ’s identity as your Savior.
Second, the gospel message of salvation that He proclaimed is true. All of His teachings are to be believed and obeyed. His doctrine must be followed if you want to spend eternity with your Heavenly Father. The resurrection affirms the truthfulness of Christ’s teachings.
Third, His going to the cross to bear the guilt of your sins was, and still is, effective for your forgiveness. You can have confidence that God will count the blood that Christ shed on the cross to have paid the price for your sins. You can be assured that when you come to Christ, in the way His gospel instructs, you will be forgiven. The resurrection assures it.
Fourth, Christ is coming again. When He returns, it will be to call all mankind, including yourself, to account for the way you have lived your life. You must appear before Christ as your eternal Judge. Your obedience to His teachings, or lack thereof, will be a basis on which you will be judged. The resurrection declares it.
Finally, you need to get your life in order, spiritually. You can only do that by coming to Christ in repentance and obedience, surrendering to Him in baptism for the remission of your sins, a blessing He paid for with His life on the cross, and begin a new life of faithful service to Him. You can be certain of the wisdom of this course of action, because of the resurrection…