Great Cumbrae on Wikipedia.
 

The Cathedral of the Isles and Collegiate Church of the Holy Spirit (Episcopal, usually open). © Jill Coulthard. Another view. © Rob Brettle. Interior view, © Charles Clegg (2011). Link.

Cumbrae Parish Church. © Martin Briscoe.

Church, possibly the Free Church, in Millport. © Martin Briscoe. Thanks to Irene McLeod for writing in confirming that this was indeed the Free Church, also known as the East Church. It was built in the 1840's. Irene's was the last marriage held in this church, in 1970. A year later it was turned into a Youth Centre.

Subsequent to Irene's contribution, Ailsa Tomany has been in contact to say that while the church pictured is indeed the East Church, it was Church of Scotland, not Free Church.

Our Lady of Perpetual Succour (R.C., 1958). © Martin Briscoe. Another view. © Rob Brettle. Interior view, © Charles Clegg (2011).