"To establish a church" means to create or start a religious institution or community where people can gather to worship, practice their faith, and receive spiritual guidance. Full definition
Some have started their own churches and others work for established churches. (relevantmagazine.com)
From board culture to ministry culture: As established churches, congregations often developed elaborate structures of boards and committees similar to those of many other voluntary organizations. (religion-online.org)
Nothing prevented «free» churches from being organized where there were already established churches. (religion-online.org)