I would reply with "Well Bless Your Heart" LOL
I am not a religious person, but I am spiritual (there being a big difference between the two) but I feel that celebrating your spirituality with something you love is the best way for you to "sing praises". I mean no offense, but what God wouldn't want you to do something you love and are grateful for everyday. Didn't Jesus say that God is all around you and you don't need a church to worship.
The majority of shows I go to are on Saturday (haven't heard of many sunday shows) but I would imagine that a Sunday tradition would come from everyone riding their horses to church and then after services wanting to see whose horses were the best movers, jumpers, etc and everyone else would have a bite to eat and watch.
At least I know that Hunter Shows stem from that vein, (i.e. Huntsman wanting to compare horses and see whose were the best), and the luncheon/watching is how the Devon Horse Show got its reputation for having fantastic food.
Gordon Wright once told a student to take up swimming because he would never be a good rider, that rider was George Morris.