Though there is a minority Roman Catholic population, and even a scattering of godless folk, the Protestant majority adheres to strict sabbatarian rules.
From the guardian.co.uk
Its development and character was influenced greatly by the sabbatarian sensitivities of the Cromies and the consequent resistance to a railway connection in the mid 19th century.
From the en.wikipedia.org
More examples
One who observes Saturday as the Sabbath (as in Judaism)
Pertaining to the Sabbath and its observance
Sabbath or a sabbath is generally a weekly day of rest and/or time of worship observed in Abrahamic religions and other practices. Many viewpoints and definitions have arisen over the millennia. ...
One who regards and keeps the seventh day of the week as holy in conformity with the decalogue; one who favors strict observance of the Sabbath; a member of a non-Jewish religious sect originating in Russia distinguished by observance of Jewish rites and festivals including Saturday as the day ...
(Sabbatarianism) The belief that the weekly Sabbath must be observed from sundown on Friday to sundown on Saturday. Often, Jewish dietary laws and seasonal days of service are also observed by Sabbatarians.