You are using a dubious assumption, Protestant Northern Europeans are more advanced/industrious than Southern Catholics. Whoever arrives in Vinland is not bringing major changes to the economic/technological infrastructure. Vinland's need for goods produced in Europe and need to trade goods to Europe will provide a steady influx of technology and news of ideas and procedures soon after they appear in Europe. The population/demographic changes will depend upon the wishes of the leadership in Vinland.
I would expect a less strict interpretation of Catholic versus Protestant battle lines in the Vinland colony if the initial colonists include a large number of pagans, incurring more toleration for religious differences. If the initial colony is heavily Christian, the issue will be whether a strong leader pushes Catholicism or Protestantism.
Remember we are discussing a POD around 1000 CE. Protestantism did not appear as an idea until @1520 CE. I would expect mostly Nordic, Irish, Basque and Dutch settlers before the Protestant revolution became prominent. If Vinland remains free of Danish or Norwegian control, the major landholders, as members of the colonial council, will determine, with some consultation with religious authorities, the accepted religious practices.
The challenge provided by the Hanse is more interesting. Vinland cannot face the League militarily or economically on equal footing. However, it may have the option to bypass Hanse controlled ports in Ireland, England, France, Spain and Portugal. North Africa is open to Vinlander trade/raiding. If they seek trade south, how long before they discover the westward route to the Caribbean? Technology can change quickly, as seen in Northwestern Europe during this time period.
What happens to slavery in Vinland? The northern natives did not use slavery to a great extent. The Norse version of slavery morphed into serfdom in Europe.