The person playing the piano, organ, harpsichord, whatever, is to some degree leading in worship. So yes, to have a nonbeliever in such a role would be dishonoring to the audience of our worship! On the other hand, a nonbeliever attending a worship service may actually be instructed by the words he is singing. Sadly, he may also be singing to his own condemnation if he does not heed the words and turn to Christ.

__________________
JWithnell
Member Bethel OPC
Virginia