You can also be a Jewish Christian Buddhist Atheist if you want. You are Jewish if you're a member of the Jewish people (i.e. descended from Abraham, Isaac, and Jacob). You are Christian if you were baptized according to a valid Trinitarian formula. You are Buddhist if you believe in and practice Buddhism. You are atheist if you don't believe in God. The point? Religions are not all "the same kind of thing" and interchangeable.