This chapter addresses one of the thornier problems in the history of emigration and colonisation to the British settler colonies. It provides an analysis of some of the consequences of the patterning of ethnicity, profession and religion, which would appear to be unmatched by few other professions or migrant groups who came to the Australian colonies. The chapter presents an account of the historical background to religious emigration from the British Isles and the responses of the churches to the crisis of personnel created by mass migration. It considers the role of colonial missionary societies in promoting religion and imperial loyalty. The chapter focuses on the characteristics of clerical migrants to the Australian colonies of New South Wales (NSW) and Victoria as their numbers peaked in the 1880s and 1890s. It discusses the development of colonial religious nationalism, typically ardently patriotic to Britain.