a broad church
1. A label referring to a group of 17th-century English theologians who adhered to some practices of the Church of England but disregarded other elements of the Church, such as doctrine and liturgical practice. Primarily heard in UK. The broad church movement in 17th-century England may have helped shape the more liberal views and practices of modern-day Christianity.
2. A group or organization composed of various types of people with differing views, opinions, or philosophies. Primarily heard in UK. The Independent Party is a broad church as its members hold wildly differing opinions on how to best solve the problems facing society today.
a broad churchBRITISH
You call an organization, group, or area of activity a broad church when it includes a wide range of opinions, beliefs, or styles. The movement is presently a very broad church, comprising, amongst others, trade unions, the church and the business community. Rock music in France is a very broad church indeed.