established church BrE
established religion BrE

"I thought you and your people were in bed with the established Church these days?"

As in the American constitution, there should be no established church at all.

There were also opponents to the support of any established church even at the state level.

Since then there has been no established church in Wales.

As a cleric of the established church he had no plans to go further.

The Pope's recent visit and the survival of the established church?

That same light revealed the corruption of the established Church.

By the 18th century their property was much reduced, and they converted to the established church.

In 1633 he resigned from the established church and moved to Holland.

It is also a particular title for the British heads of state in respect to the established church.