Fwiw, the study said results for Christians and Moslems were similar. It would be interesting to see the correlation of other factors, such as income. Maybe children from better-off families are more inclined to give away hypothetical stickers to an anonymous, same-ethnic-group peer in their school.
Or maybe religious children had more of a “This study is crap” attitude toward the study, “Just give me the stickers so I can leave.”
What would be the charitable purpose of sharing stickers with strangers? What is the noble purpose of the sticker? When playing Monopoly, are you going to give away your properties, hotels, and houses to some unseen person in the next room? Hell, no! Does that mean you are a bad Christian?
Ask the kids to share some of their meal with a starving child in the next room and let’s see how many are willing!