I don’t see much real value in such a designation as you seem to be promoting. There are many Christians in the world who fall from perfection in accepting everything they should, or following through on living that out, and yet they are still Christians. Language just doesn’t work the way you wish it did. Christians come in many forms, from the nearly perfect to the very flawed, and there is no indication that they stop being Christian because of their failure. Bad Christians may be, but Christian still.
Think the way you want. When the time comes - it’s too late.
Some simply refuse to be taught.