I present the definitions of the word "Christian" here for reference:
- Professing belief in Jesus as Christ or following the religion based on the life and teachings of Jesus.
- Relating to or derived from Jesus or Jesus's teachings.
- Manifesting the qualities or spirit of Jesus; Christlike.
- Relating to or characteristic of Christianity or its adherents.
- Showing a loving concern for others; humane.
Now, for all practical intents, definition 1 is the only that can serve to accurately define a group. And definition 4 is simply "person who is like a person who fits one of the other definitions". Definition 3, and the related definition 5, are those that are relevant to the usage of the term as a form of acknowledging merit; as a word that is used in a similar to manner to "good". Of course, this isn't because of any assumptions that the Christians represented by definition 1 are inherently better people than others, but because it is entirely different usage of the word "Christian", in that it is referring to those who act "Christlike", and are being compared to Jesus, rather than simply being among the adherents of the religion Christianity. But, unfortunately, this distinction is rarely made clear, especially by those who like to equivocate in order to gain a false veneer of credibility.
And what fertile grounds for such equivocation! The only term describing a member of your religion is also the same term used to describe one who behaves like the idealized man-god that the religion worships, and all of the virtues that go along with that. You would have to be Jesus himself to be able to resist using that fact to your advantage when trying to claim that those who are not "Christlike" are not "Christian" [*cough* by one definition of the word *cough*]. And therefore, Hitler was a Scientologist. Completely disregard the fact that your entire religion is based upon the idea that even the most heartless and wicked human being alive can attain salvation by calling upon Jesus for help. Completely ignore that all humans are imperfect and inherently NOT "Christian" [by that same definition] according to your religion, hence the need for Jesus in the first place. Anything to win an argument.