"...if "First you get down on your knees," how the heck can you then proceed to "Genuflect! Genuflect! Genuflect!"?"

Easy peasy - you kneel in the pew, and you genuflect when you get out into the aisle to go home. A tricky enough operation - "You can always spot a convert - they fall over..."

The one that gets sung more often than any other in folk circles seems to be The Irish Ballad, Riccety-tickety-tin" - a lot easier to get your tongue round than most.