Romuwa

https://en.wikipedia.org/wiki/Romuva_(religion)
The Romantic epoch started in the 19th century. This led Lithuanians to look back to their past for both intellectual and spiritual inspiration. The national revival started and Lithuanian intelligentsia idealised ancient paganism and folklore. Some historians wanted to prove the beauty of ancient polytheism and even started creating new aspects of Lithuanian mythology. One of the most famous of these was Theodor Narbutt who edited Ancient Greek myths and created new Lithuanian ones.
In the beginning of the 20th century, ancient pagan traditions were still continued in folklore and customs. People were celebrating ancient pagan festivals mixed with Christian traditions. Such festivals include Vėlinės (day of dead souls, common with Celtic Halloween), Užgavėnės (festival when winter ends and spring begins), and Rasa or Joninės. For Užgavėnės, people in Samogitia may dress in costumes including masks and burn an idol of an old lady, called Morė or Giltine, goddess of death.

Modern folk religion
The philosopher Vydūnas is taken as a sort of founding father of Romuva. He actively promoted awareness of and participation in pagan festivals. Vydūnas saw Christianity as foreign to Lithuanians, and instead he brought his attention to what he saw as the spiritual vision of the adherents of the traditional Baltic religion. He ascribed to this a sense of awe in their cosmology, as they saw the universe as a great mystery, and respect for every living being as well as the earth in their morality, as they saw the whole world and every individual as a symbol of life as a whole. The Divine was represented by fire, which was as such used ritually to worship the divine and itself held sacred. Vydūnas had given special treatment to this religion of the Lithuanians in his drama Amžina ugnis (An Eternal Flame). Among this and other works, Vydūnas exalted the faith as being on the highest level of spiritual expression, along with other forms which he recognized