Firstly, it must be realized that in the pre-modern age (before the 18th century European Enlightenment), everything was explained, validated and formalized in terms of religious and supernatural ways of understanding. Cultures were necessarily loaded with spiritual significations. Everybody went about their daily routines (of waking up, bathing, preparing and eating food, beginning and ending work, setting off on a journey, etc.) and major life events (such as birth, coming of age, qualifying in a trade, betrothal and marriage, childbearing, death and burial) guided by beliefs and rituals that sought the blessings of good powers and protections against evil powers. Nothing was 'secular'. Everything was 'spiritual'. So, if someone discovered a medicine, it was introduced as a revelation from a god or ancestral spirit. If rulers wanted to enforce a social structure on a population, they commanded it as the will of the gods from creation. If someone developed a dance form or exercise routine, it was dedicated to a god and ritualized as an act of worship. Astronomy was part of astrology and chemistry was part of alchemy. There was no other way to give anything importance and pass it on from generation to generation if it was not somehow connected to religion.
https://www.academia.edu/5180952/Are_Sri_Lankan_Christians_Afraid_of_Culture