There’s quite a bit of Christian stuff.
Sisters, crosses, etc.
Miss Monday is wearing a nun’s habit and pretending to be a sister.
There’s also a real sister (Mother Carmel).
Bartholomew Kuma is holding a Bible.
Wasn’t Kuma’s family home a church?
There’s even a Miss Merry Christmas.
The Birth of Christ
Christ’s Mass
Miss Valentine
Valentine’s Day also originally originated from Christianity.
Apparently, it originated from the execution of the Christian priest Valentine.
Maybe they share the same culture as in real life.
Maybe there’s also Golden Week, due to the Baroque Works connection.
Golden Week is a holiday unique to Japan, so the One Piece world probably shares the same culture as Japan.
Do they have the concepts of Monday, Wednesday, Father’s Day, Mother’s Day, and weeks and holidays?
I’ve never heard of this before, so it’s probably just a random codename.
Or maybe they have the same name but with a different meaning.
When Usopp heard about the Sun Tree Eve, he said it might be related to the Treasure Tree Adam, so it seems like there might be something like the Book of Genesis in the Bible.
There’s also Noah in Fishman District.
Is Noah made of Adam and Eve?