apparently Zionist means someone believing in returning to somewhere called the promised land, and I don't know much about being a jew but I guess believing in promised land is an important principle as well, so is there a difference? Thanks
closed as off-topic by Moshe Peston, Shmuel Brin, not-allowed to change my name, Isaac Moses, Danny Schoemann Feb 9 at 8:11
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Here is an article about Christian Zionism. With Zionism as you defined it in your question, there is a big difference to being a Zionist and being a Jew.
With Wikipedia's definition of Zionism, this is a "movement of Jews and Jewish culture" by definition. Someone could ostensibly be a member of Jewish culture and not a Jew (many children of intermarriages may fit this category) and would therefore seemingly fit this definition of Zionism.
In any case, your question assumes that all people who agree to a certain fact are the same. You cannot distill almost any belief system in to one belief. Zionism may be a subset of Judaism, but they are by far not the same. Much similar to the famous analogy of a square being a rectangle.