Could the Pagan Baltic states and the Vikings form a common state.
They could. Remember, the Vikings did have a bit of a foothold in the general area for a while and the Balts weren't exactly totally powerless. Perhaps it'd start out as a coalition and then go from there.
Could the Pagan Baltic states and the Vikings form a common state.
but how are you going to prevent the christinization of the scandinavian people??
What little I have personally read on the subject agrees with this above view. The amalgamization of the area around Stockholm was very bloody and full of losers enslavement, with their own people.Well considering the many wars and feuds between the various Nordic (Viking) states and minor Kings, eventhough they are so cultural alike; it would be even more difficult to unite with the Baltic states whose culture is much more different.
Should it have a opportunity, you should have a united Denmark-Norway-Sweden, much earlier than the Kalmar union, and this union should then conquer the Baltic states, and colonize these. The focus of the new union should then be East in stead of West (UK, France etc.) as IOTL.
But as history have shown, keeping such a union would be extremely difficult.
Well perhaps a militarily more powerfull alliance could better withstand Christian pressure to convert....but I do off course see crusades looming...
A coalition against whom though? More successful Mongol invasions?
The Vikings did not convert to Christianity under coercion or pressure. No Christian armies invaded Denmark, Norway, or Sweden. Their kings converted because of the benefits derived from being part of the greater Christian European state system and cultural inheritance. That still remains even if there is some overking over all Scandinavia and the Baltic.
Crusading as an ideology developed in response to the disruption of safe pilgrimage to Jerusalem and requests from the Byzantines for help after their defeat at the Battle of Manzikert. After several centuries of development, it eventually started to be used elsewhere than the Holy Land in the 1200s. None of this is in place at the time a pagan Norse superstate could emerge.
You are right that no coercion took place IOTL. But if the point of view ITTL is that the vikings remain pagans, then a religious conflict would eventually emerge. As IOTL this occured in Northern Europe in the 12th and 13th (Among others by the Danish King). If a united pagan northern kingdom exists during this time, they would become targets of Catholic crusades.
As I have stated elsewhere the main challenge is ofcourse to stay united until then.