Crediton on Wikipedia.
 

The Collegiate Church of the Holy Cross and the Mother of Him who hung thereon. The church, built on the site of a pre-Norman Conquest cathedral, is largely of 15th century work, but there is some fabric of the 12th and 13th as well. From an old postcard (franked 1906) in Steve Bulman's Collection. A modern view, © Andrew Ross. SS 836 002. Link. Grade I listed.

Crediton Congregational Church. SS 829 004. © Andrew Ross. Grade II listed.

Crediton Methodist Church, on Union Road. SS 833 003. © Andrew Ross. Link. Grade II listed.

St. Boniface (R.C.) on Park Road. SX 837 999. © Andrew Ross. Link.

Although marked on an O.S. map as a church, this building on the High Street is now a nursery. Do you know its former denomination? SS 828 004. © Andrew Ross. Janet Gimber advises that this was built as Bible Christian, and opened in 1860. The congregation merged with a former Wesleyan Methodist congregation to form a United Methodist Church in 1954, and the building was sold to "the Gospel Hall people", i.e. the Plymouth Brethren. It was subsequently known as High Street Chapel.

Howard Richter advises of some other churches and sites of demolished churches in Crediton -
Moose Hall on Bowden Hill is a former Wesleyan Chapel of 1815. Photos are available here, and it can be seen on Streetview here. SS 8352 0011. Link.
A Presbyterian and Unitarian Church stood on Park Street at about SS 834 002. Now demolished, flats have been erected on the site. Streetview.
A Baptist Church stood on High Street at about SS 8328 0027. Also demolished and replaced by flats - Streetview.
The former Plymouth Brethren Hall on High Street at about SS 8292 0036. Streetview.
The Chapel of St. Lawrence stands at SS 8257 0040. Ruinous for almost two centuries after the destructive fire of Crediton in 1743, it was restored in the 1920's. A photo is available here (scroll down). Grade II listed.