What I mean Steve is that those identified as Christians will be called by God's name.
Many are called "Christians" but few actually are. You have many called Christians today that wage war and supposedly cast out demons and do many powerful works in the name of Jesus, but are in fact workers of lawlessness.
(Matthew 7:22-23) . . .Many will say to me in that day, ‘Lord, Lord, did we not prophesy in your name, and expel demons in your name, and perform many powerful works in your name?’ 23
And yet then I will confess to them: I never knew YOU! Get away from me, YOU workers of lawlessness.
God's people are "no part of the world".
(John 15:19) . . .If YOU were part of the world, the world would be fond of what is its own. Now because YOU are no part of the world, but I have chosen YOU out of the world, on this account the world hates YOU.