And it was appropriated and modified by the Christians (Christianity spread so fast and dominated so much I don't even know how, yes they colonised but how the hell did they assimilate the Romans so easily), but now it's been a consumerist holiday more than a spiritual one for about a century. Many cultures still celebrate it the Christian way, sure, and many just utilise it to buy their loved ones material gifts and get like gifts in return, more than focus on the now largely unnecessary celebration of surviving winter, or having close social connections.

Source?