Students prepare for their bar and bat mitzvahs at a camp for Jewish children of color in California. AP Photo/Jacquelyn Martin“Tradition!” rings out the opening line of “Fiddler on the Roof,” the Broadway play that brought Jewish life to stages around the world. The 1964 musical gives audiences a window into Yiddish-speaking, rural Jewish life in 19th-century Europe. For many people, this image represents Jewish history as a whole. When most Am…