Lets say for whatever reason Rome never Christianizes and it never becomes widespread, however the empire still falls because of the OTL reasons and the Germanic migrations start , however if these tribes were never christianized how does this affect the kingdoms they build in the ruins of the empire ? Will they be a pagan medieval society (although in a pagan society laws would be very different for example more bathing, women with more power etc.) or will they retain some form of primitive tribal structure like they did be fore the migration era ? What kinds of buildings would they build ?