“Mythology” doesn’t mean “Religion we don’t believe in”, it means a collection of stories. One does not exclude the other, you can have religion without mythology and mythology without religion, but you can also have religion with mythology. Most living religions *include* mythologies as components. The Christian mythology is a thing and is mainly the collection of stories found in the Bible. Islam mythology is in large parts overlapping with Christian and Jewish mythology, but also includes the stories of the Prophet. Hindu mythology is the stories of all the Hindu Gods, contained f.i in the Puranas and the Ramayana and Mahabharata epics.
What separates religion from mythology is that religion includes all the “practical” aspects of organised religion on top of their stories: how is the religion practiced, what are their clerical hierarchies, what rituals do believers perform, what is the structure of the religious practices, what do the humans that actually believe in this religion do in expression of their faith, do people worship in special buildings or out in the woods, and so on and so forth.
The story of the last supper is Christian Mythology. The real-world ritual of the eucharist is Christian religion.
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