I was going to pick Highland Cathedral but realised after some research it’s not a true hymn! However I feel God was present when these lyrics were written:
Rise Caledonia, let your voices ring
In this Highland Cathedral of our God and King
Whom, joy and liberty, to all, will bring
Come; let your heart, with love and courage sing
My sister was part of Inverclyde Junior Choir back in the day and they sang it when taking part of BBC Choir of the Year. Hearing children sing this song makes you believe in some magic, especially if accompanied by some bagpipes!
I think this may also qualify as Scotlands unofficial National Anthem!