From the book of First Peter we learn that, as believers in Christ, we have many identities. In chapter two, alone, we are called "babes", "living stones", "a chosen generation", "aliens and pilgrims", and "sheep returned to the Shepherd". Like newborn babes we need pure nourishment, like a mother's milk...and that food is the word of God. Like living stones we are being shaped and placed in the walls of God's house and Christ is the cornerstone of that house. As "a chosen generation" we have a special mission to proclaim His truth and to reflect His light. As "aliens and pilgrims" we know that this is not our home and the ultimate pleasures of earth are nothing compared to the ultimate pleasures of Heaven...where we are headed. Like "sheep returned to the Shepherd" we remember that we were lost and wandering but have been found and reclaimed by the Great Shepherd. Of course we really have one identity in Christ...we are His. Rather than having an identity crisis...torn between heaven and earth, we need to be 100% His because there are so many who have not yet discovered who they can be in Christ.
1 Peter 2:10 for you once were not a people, but now you are the people of God, you had not received mercy, but now you have received mercy.