It's worth being precise so that we are are talking about the same things when we use the words:
Myth---
noun 1. a traditional story, especially one concerning the early history of a people or explaining some natural or social phenomenon, and typically involving supernatural beings or events.
2. a widely held but false belief or idea. "he wants to dispel the myth that sea kayaking is too risky or too strenuous"
Religion---
noun 1) the belief in and worship of a superhuman controlling power, especially a personal God or gods. More---a particular system of faith and worship. (plural noun: religions)
2) a pursuit or interest to which someone ascribes supreme importance. "consumerism is the new religion"
A myth is a story, not a theological exposition---is intended usually to help or be enjoyed and to be discarded if it does not.
A religion is a belief in and worship of a superhuman controlling power. Aquinas argued that a First Cause exists and is God. And the Catholicism that I am involved in is no myth.
When you download a file into your mind over a period of years, be sure to unzip it so you know what it actually implies.
Religions and myths were mired together in times like those of the ancient Egyptian and Greeks and among the Hindus.
There has been a trend of stripping religions of myths. This trend continued until Christianity allowed itself to become a vehicle for giving added life to Roman, Greek, Norse and other myths.
These myths have become indelibly enshrined in celebrations in Europe like Christmas and in the names of some months and days of the week.
Europeans then, through colonisation, spread them throughout the globe such that even the most powerful of people around the world in the 21st century continue to keep alive the memory of those myths which would have otherwise been long forgotten..