(C) Owner for the photo
I don’t know why but it seems that some devotees are simply devoted to visiting churches just to take selfies, have fun, and leave trash behind— nothing more. If there are no bins around, littering is not an excuse as it’s really not that hard to bring your own trash bag.
It is definitely unbefitting of the so-called “spiritual journey” that these devotees do to show their faith, ask forgiveness, and give thanks. A little discipline won’t hurt, you guys.