Zitat von
http://www.ckiiwiki.com/Pagans
Disadvantages
Reformed pagans no longer get a defense attrition bonus, and will incur attrition in the territory of unreformed pagans, except those who follow the old form of their own religion. Norse rulers lose their retinue size bonus and now get penalties for raised levies like other rulers.
Reformed religions lose access to subjugation wars, one of the fastest ways for pagans to expand. They keep access to county conquests and raids.
Reforming the religion will cause a schism in the pagan faith - the reformer will be of the new religion, and so will their direct vassals, but others have a random chance (or a choice if the player) of being one faith or the other. Old religion followers will be heretics with a -35 penalty to relations to members of the reformed faith. If a king of a faith stays true to the old ways, and many vassals convert to the new religion, this can cause tremendous upheaval in a nation, and lead to multiple simultaneous revolts. Expect frequent raids and wars between realms that accept the new faith and those that reject it.