I would accept the evolution of the word Christian as you've outlined. The reason being is it would completely alter the meaning as it is now. That often happens with words<quoted text>
You are lying. You would not accept that evolution.
You are also lying about "atheism". The root is "atheos" - no god.
no god + ism = belief that there is no god.
"Christian" would no longer represent what it does..
a-, an-(not, without) apolitical, atheist, anarchy, anonymous, apathy, aphasia, anemia
It means "not theist", or, "without theism".