Slovenia observes 31 October as Reformation Day, a public holiday, in a country where Protestants are a fraction of one per cent of the population. The reason is that Slovenes date the existence of their written language to the Reformation, and treat the two as one event.
Before 1550 there was no printed Slovene. There were scattered manuscript fragments, the Freising manuscripts among them, and a spoken language with no standard and no literature. Trubar's decision to print in the vernacular for a peasant readership, taken on Protestant principle rather than for literary reasons, created the standard. His famous address to the reader, opening with the words for my dear Slovenes, is the first time the community is named in print in its own language.
What followed within a generation was a full apparatus: Dalmatin's Bible in 1584, printed in Wittenberg because printing was prohibited in the Habsburg lands, and Bohoric's grammar, written in Latin, describing Slovene as a language with rules. The Counter Reformation then destroyed most of the copies. The Bibles survived largely because Catholic priests kept them and used them, there being nothing else in Slovene to preach from, which is a quiet detail that says a good deal about how the two confessions actually related on the ground.
The holiday is therefore not a confessional statement. It is a national one, and the object it commemorates is a book. Slovenia has a second literary holiday in February, Preseren Day, named for its national poet, so the calendar contains two public holidays for writers and none for a king.