Irvine's preaching during this latest mission influenced others who began to leave their respective churches and join Irvine to form an initial core of followers. Some of these early adherents would become important members of the new church, including John Long, the Carroll family, John Kelly, Edward Cooney—an influential evangelist from the Church of Ireland—and George Walker (an employee of the Cooney family's fabric business), all of whom eventually "sold all" and joined the new movement as itinerant preachers. Although other movements, such as the Plymouth Brethren and Elim have had strong Irish connections, the church founded by Irvine is the only religion known to have had its origin and early development in Ireland.