All elements in religion emerge from its system of rules, assuming that the religion is a system. This system of rules is described in its scriptures, assuming that the religion is documented. From there on, you can use its system of rules to derive new propositions that are valid in the religion. Well, not always, because Martin Luther was told in April 1521 that his arguments "through scripture and reason" were not necessarily valid in the eyes of an Augustinian monk's employer. Hence, even that last bit depends on what religion it is about.