Are Catholics, Jews, Mormons considered Christians?

@BohemianBoo that’s a fair point about Jewish people. It’s a bit more complicated then just purely faith.

@DarkHeaven Please clarify what you said.

@sree251 A Jewish person is not necessarily a practicing Jew as far as the faith. It’s an ethnic group so he’d still be a Jewish person even if he had decided to become a Christian or a Muslim for example. So you’d have to clarify a bit more there.

@DarkHeaven Do you mean that a Jewish person is not necessarily a practitioner of Judaism? This is a clearer way of putting it. The phrase "practicing Jew" is similar to "practicing Mongol". It's not only awkward to put it that way but also inaccurate. Although Judaism is a faith of Jews, not all Jews profess that religion.

We all know what a Jew is just as we know what a Turk or Greek is. In the case of the Jew, Judaism is rooted in the cultural origin of the Jew. This is truly unique in human anthropology. Even the Chinese people, whose cultural identity goes way back, don't have a distinct religion shaping it.

@sree251 Technically that's true. A Jew who practices Christianity is literally a practicing Jew. But in everyday use, the term "practicing Jew" is only used for people who practice Judaism, since that's the traditional religion of Jews. A Jewish Christian would simply be called a Jewish Christian.
Language is far from perfect.

@BohemianBoo Christian Jew sounds better. "Jewish" has the religious connotation associated with Judaism.

Come to think of it, even Christian Jew sounds odd. This is because the idea of a Jew is stamped into our heads by the story of Jesus.