I was about to mention that but you beat me to the punch.Eh, it's been proposed a lot of times, SHWI has a Submission TL where an Islam-analogue arises in Scandinavia.
do u have the link for the TL?There were some comments in an earlier thread about the possibility of a Mohammed originating in Scandinavia among the Vikings rather than in Arabia- though that could be ASB or not count as "Islamic" for the purposes of the challenge.
I did have Denmark convert to Islam in my Muslims Win at Tours TL, but that should hardly be taken as a plausible way to do anything.
also i read another TL somewhere when Vikings raid Al Andalus they find a very liberal and propseprous relgion. they take news of this strange religion to their homeland, and the raiders exaggerations make people flock to convert en masse
wasnt my TL, read on some TL abt Granada survivng as an emirate etc. etc.
That's all I can say. Unfortunately, I find myself doing that after reading many of your posts.
maybe with immigration like france which is now 10% muslim? maybe trade like how indonesia became muslim?