My devout JW wife loves Amazing Grace too as do I.
even if they do not believe the message contained therein
The funny thing is many christian songs are denomination-neutral - even more, many so called "holiday songs" like Jingle Bells are not religious at all, yet frowned by JW. Amazing Grace for example almost could fit into the JW songbook as to the ideas in the song - except that 5th verse, which with a bit of a doublethink that is so well known to JW could be interpreted as talking about the resurrection in Paradise.