Many people with whom I engage do not have a grasp on their identity, although they have been self-identified as Christians for years. This failure of knowing is revealed by insecurity of being, search for significance, hair-trigger defensiveness and the like.
For this I fault the traditional church which has been big on pointing out sin, you miserable wretch, you, and all the ways you need to follow to remain in the fold of their acceptance. Although they teach “It is by grace you are saved, and not by works,” their very requirements whether stated or implied, are translated as works-to-earn in the mind of the believer so that there is much “doing” – with its accompanying sense of never enough, and little “being,” with its feeling of rest, acceptance and joy.
What scripture shows, and the Church tends to overlook, is that the Almighty, God of Everything, has come to this little planet, down to our level, and has self-identified as our Father. He has (already) dealt with the sin problem and now incorporates us into Himself in a huge, other-worldly embrace so that we experience life two in one, as it were. We really do become His children, not just His creation along with lemmings and butterflies. Since we are (already) accepted and loved, we should not have to prove it, or strive for it. Instead, we rejoice that He is within our very beings and go forward into fullness of life totally loved and unafraid.