"A woman in Christ ... knows whose she is, and therefore knows who she is. " -Captivating by John & Stasi Eldredge pg. 199This quote is totally reaffirming that those who realize they belong to Christ and are in him ultimately know who they themselves are. God gave us each personalities and crafted each of us a beautiful lifestory, and by being "In Christ" that story of who we are meant to be unravels. But when we do not follow God, we stray from our identities - who we are meant to be - and in that, we are lost.
I think anyone who believes that they are "In Christ" can remember when they were lost. But now that we've found God, our life has become new in our true identities. To me, that is what is crucial. Anyone who is "In Christ" shows clear evidence in their lives that they have changed and that they are drastically different from their past in perspective and interactions. Yes, God has made us into new creations - the old has gone and the new has come. And in that new life is our identity in Christ, and it's the most fulfilling life ever, even beyond what we could hope for.