Nivek ... lets make a deal... we won't try to claim that Islam is everything it aren't and you don't try to claim that its so easy to adopt, as its flying in the face of so many core tenets of even non-religous life in Scandinavia that the idea is a lead balloon to begin with.
Pigs was the primary source of meat in Scandinavia, as Cattle in the Scandinavian Peninsula (Norway, Sweden) is (only) just on the wrong side of superior livestock due to being on the edge of them being able to survive, even not accounting for the fact that domisticated Pigs are easier to hold as they can eat some of the organic waste a family no doubt creates (leftovers, inedible parts of vegetables etc). In Denmark the difference was so minor that it was largely a question of tradition and how other populations with communicated with did. The primary reason why Cattle was still used to the degree it was in scandinavia was that it was seen as a luxury food that only the wealthy was able to allocate resources for.
Mead was the primary source for liquids as it stored well and, prehaps more importantly, due to the process of how it was created it was clean for paracites and other unclean stuff that could cause diseases of different kinds... Everyone drank mead in Scandinavia, even the kids and slaves (although their mead was near, or just above, what can legally be sold as non-alcoholic), without some very good replacement, going off mead would probably be one of the surest ways to let epidemics take some local tours with concerning regularity.