User blog comment:D.Ryan/Do you think they had Christmas in Rapture?/@comment-1890183-20101215072114

Well, in the multiplayer in the Home for the poor there's a intercom anouncement about the "Holiyday season" and needing to do some shopping. So I'd agree with Willbachbakal that they did but it was more comercial and not very religious, much like it is today. :)