His voice was so musical, in fact, that he would regularly sing religious songs as his sermon for the day. (religion-online.org)
The Hallelujah Chorus from Handel's Messiah would rank at the the top of my list of essential religious songs. (firstthings.com)
There is a very large number of songs in all non-religious-labeled musical genres that will do quite well and give any musician a properly rounded musical education without the need for extreme religious songs being included at any point along the way. (religion.blogs.cnn.com)