Bok, Trickett & Muir once introduced a song called "The Middle Class Life is the Best of All" with the comment "...you don't have to believe everything you sing."

Why, I sing "The Stern Old Batchelor"

("..I do believe I'll never live with women anymore.."

so, sure...I have sung in Christian gospel workshops with Baptists, Episcopalians, Jews, agnostics and atheists. Each felt inwardly whatever was right for them...but the songs were wonderful and made everyone happy.