Consider prayer. Creed may address affirming its divine obligation and the truth of divine commands. Jurisprudence deals with prerequisites, elements and correct performance. Ethics and spiritual discipline can examine attentiveness, sincerity and avoiding ostentation.
These are not three different prayers: they are three scholarly perspectives on the same worship. The purpose of classification is to choose appropriate questions, terminology and evidence, not to separate parts of religion artificially.
A learner asking how prayer must be performed needs legal detail; a learner asking about its foundational religious authority is asking a different kind of question.