This article discusses John Glas, a minister deposed by the Church of Scotland in 1728, in order to examine the growth of religious pluralism in Scotland. The article begins by considering why Glas abandoned Presbyterian principles of Church government, adopting Congregationalist views instead. Glas's case helped to change the Scottish church courts’ conception of deposed ministers, reflecting a reappraisal of Nonconformity. Moreover, Glas's experiences allow us to distinguish between church parties formed to conduct business, and those representing theological attitudes. Finally, Glas's case calls into question the broadest definitions of the ‘Scottish Enlightenment’, drawing attention to the emergence of pluralism.