As a body of Christians, Christians all accept the Nicene Creed. It's the one thing they agree upon. If someone were to claim to be a Christian, yet disagree with the terms of the Nicene Creed, then to the entirety of the Christian population, that person wouldn't be a Christian. No "true" bollocks involved. You either are or you aren't.
Now to some bollocks secular definition, you could make up what rules you like to define Christian. Like you're a true atheist because you don't believe in some gods. Get my drift? I can define atheist all I want, but only one definition is actually true.
Now to some bollocks secular definition, you could make up what rules you like to define Christian. Like you're a true atheist because you don't believe in some gods. Get my drift? I can define atheist all I want, but only one definition is actually true.