They ran into a real problem with the sacraments ~ no wheat and no wine in lapland in those days!
Then there were problems with the Scandinavian countries, the new Swedish Empire for one, so Christianization stalled out for a good while. By the time it was restarted these folks were being sent to America by the boatload.
The other relationships grew out of that particular background.
Islam itself seems to have similar foundational problems starting with a failed attempt by Christians in Damascus to Christianize the Arabs of Mecca. so to that degree there is a common feature. However, the impetus that set everything in motion was wholly Christian in both cases.
One of the problems inherent in the tradition of single missionaries going out alone is they find it difficult to extirpate the former pagan belief systems until it is too late.
Santa Claus, the third most popular diety on the planet is clearly an outgrowth of Lapland and North Asian shamanism!
I’ve not found anything about Russian Orthodox connections to “First Born Church”, which (all three main versions) are branches directly from the LDS folks.
Is there another “First Born”?