Because, I have rationalisations that allow me to listen to the music I listen to. I'm aware that the members of a lot of the bands I listen to are less-than-Christian, and some of them have songs with lyrics that might offend or scandalise. But Ralph Vaughn Williams was an atheist, and Vivaldi lived a scandalous life. Mozart and Haydn were Deists at best, and Ned Rorem is an atheist as well*. People still use their music in churches anyway.
*Among other things. His music is highly underrated though.