I am a singer. Nature provided me with physical characteristics that produce sounds that can be pleasing to the human ear. People tell me I sing wonderfully. Over the years I finally learned to accept praise. I tell them what I truly believe. I am only a conduit through which the music moves. I enjoy singing. It is freeing in a way that I cannot describe with words. I have heard athletes describe the state of mind they are in when they are playing at their peak. It is much the same for me, and other musicians I have spoken with about the state of mind we are in while performing. If you think about it, you mess it up. I cannot try to sing the music. I must 'turn off' my conscious mind, and allow the music to flow. (longer post on just this subject later)
I have had NonTheistic beliefs or at least thoughts since I was 15. That was 28 years ago. Growing up in a musical household, my mother was the church organist, my father plays the guitar, I learned to read music and words all at the same time. The first music I sang was Christian hymns. Even as a young child, it was my favorite part of the service. I just remember being bored a lot during service, other than the singing. I usually took a nap during the sermon.
During my 40 years of singing, most of the works I have performed have been religious in nature. There have also been many secular works as well, however the majority have been Christian in nature. I could choose not to perform them. However, I would never want to miss out on an opportunity to perform what I consider to be some of the most beautiful music ever written. Bach, Beethoven, Mozart, Brahms, Faure, anytime I have an opportunity to perform this music, I am there. For me, it is about the music, not the words. Yes, the words can paint wonderful visual imagery, as in Pie Jesu, from Faure's Requiem. The words can also paint images of dark dread and despair as in Dies Irae, from Mozart's Requiem.
For me, it is about the music. The sounds that are created, the overtones, the way certain venues can fill up with sound and echo around in a specific way to create sympathetic sounds, and even more overtones. The music is transformed into something tactile. It takes genius to write music that can have these effects. Would I skip performing music like this because it is religious in nature. Not for one second.