Israel was a type of God's messianic servant, and Jesus Christ was the fulfillment. But thou, Israel, art my servant, Jacob whom I have chosen, the seed of Abraham my friend. Christ is the perfect vine, all that could possibly be symbolized in a vine comes to fulfillment in Christ. It's amazing how many people who claim to be Christians have other vines in their lives from which they seek their resources. Some people think their vine is their bank account, education, sexual relationships, popularity, skills, connections, possessions, or social relationships.
Some people even think that the church is their vine.
Our vine should be Jesus Christ. Attending church is not necessarily evidence of a vine-branch relationship. You as a branch must grow with Christ as your vine. Israel was the vine of the Old Testament, but Christ is the vine in the New Testament. Israel was often referred to as a degenerate vine.