You can refer to an organization, group, or area of activity as a broad church when it includes a wide range of opinions, beliefs, or styles.
It rapidly became apparent that rock'n'roll was a very broad church indeed.
See full dictionary entry for church
Broad Church in British English
noun
1.
a party within the Church of England which favours a broad and liberal interpretation of Anglican formularies and rubrics and objects to positive definition in theology
Compare High Church, Low Church
2. (usually not capitals)
a group or movement which embraces a wide and varied number of views, approaches, and opinions
adjectiveBroad-Church
3.
of or relating to this party in the Church of England
Broad Church in American English
a liberal party of the Anglican Church in the late 19th cent.