Some example is the diversity of the number of Gods: from 1 in Judaism, to 1 but in three persons in Christianity, to tens in Greek and Roman Mythology to thousands if not millions of Gods in Hinduism.
Further, there is a diversity of rituals, as seen in the areas with multiple religions.
Also, for example, some religions have to be inherited (Zoroastrianism, Judaism) and some have to be adopted by the people knowingly (Baptists)