The problem here isn't trying to judge one's spiritual potential, it is giving God the worship that is due him. How can a non-believer worship in spirit and in truth if he has not embraced Christ and his gospel?

This was not a hypothetical for me. At our wedding, my professional, classically-trained sister (who is not a believer) played the prelude, but after the call to worship, our regular pianist took over.

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JWithnell
Member Bethel OPC
Virginia