Question: Where did the superstition saying knock on wood come from?
Disambiguated questions and answers: question: Where do some explain the superstition saying knock on wood comes from involving protector beings trapped in trees and tapping wood for protection?
Where do some explain the superstition saying knock on wood comes from involving mystical creatures living in trees and touching wood to request good luck or distract the creatures?
What Christian religious pieces may explain the superstition saying knock on wood?
Where do some explain the superstition saying knock on wood comes from involving tag?
answer: folklore
Celtic or German folklore
Pagans
wooden crucifixes
crucifixes
players are safe from being tagged if they are touching wood
"Tiggy Touchwood"
Natural Questions answer: German folklore (from the Wikipedia article "Knocking on wood")