You’re right, essentially all so called Christian holidays and traditions are just rebranded older traditions from other religions. People were far more amenable to converting to or at least tolerating Christianity if they could continue their existing holidays and traditions largely unchanged, so Christian churches came up with various explanations for why those holidays were now Christian. It’s why for instance Christmas is in December suspiciously close to the winter solstice despite all evidence pointing to Jesus being born at a different time of the year. Sometimes they don’t even bother with trying to pretend like with Christmas trees and the Easter bunny (also the name Easter).
You’re right, essentially all so called Christian holidays and traditions are just rebranded older traditions from other religions. People were far more amenable to converting to or at least tolerating Christianity if they could continue their existing holidays and traditions largely unchanged, so Christian churches came up with various explanations for why those holidays were now Christian. It’s why for instance Christmas is in December suspiciously close to the winter solstice despite all evidence pointing to Jesus being born at a different time of the year. Sometimes they don’t even bother with trying to pretend like with Christmas trees and the Easter bunny (also the name Easter).