The difference in between Sunni and Shiite Muslims is based on believe and faith rather than traditions. Usually they have same traditions since they live demographically close to each together.
That is the exact same word just typed twice, the only difference is that one is capitalized and one is not. This probably means that the sentence would start with tradition and that is why one was...
a : an inherited, established, or customary pattern of thought, action, or behavior (as a religious practice or a social custom)b : a belief or story or a body of beliefs or stories relating to the...