Jesus' resurrection proves He is the Son of God who has paid the believers sin debt and opened heavens glory.
God revealed Himself to Abraham and continues to do so to offer salvation to the lost.
Jesus Christ lives out all His teaching, especially to love one's enemies
Jesus Christ came in the flesh and died on the cross to manifest the love of God as unto salvation and godly living.
The Jew and the Christian are both save by faith, not works. God uses Israel as a physical example of spiritual truth.