Da Vinci’s the last supper is much more of an art accomplishment than a symbol of Christianity. I’ve seen soooo many parodies of the last supper that just wanted to make a simple joke using something people recognize. Again, not everything is about religion, for example, the satanic temple has “Christian symbols” but is a fully securely belief system.

Edit: so it turns out they were actually doing “Jan Harmensz van Biljert’s Feast of the Gods, painted +/- 1635”. It’s the most Christian thing to do to just assume cause it reminds you of your symbolism, you get to restrict how people use it.