Well for one thing, avoiding Christianity in the region all together is a good. The church though as ignorant as it may have been did hinder the chances of the survival for the original colony. How this could be done I don't know though it could provide for a reason for 'Europe' not to bother with Greenland leaving a reasonably stable agricultural nation. As these atl Norse Greenladers would be less hostile towards the Inuits in general of course they are going to gain some influence from them of which will only benefit the Norse in the long run. As the centuries roll on a bit trade will surely develop with mainland North America and likely there will be some Norse settlements along the region as well. Assuming the Norse don't integrate with the indigenous populations to the point of losing what makes them who they are and all of that you could have a series of strong Norse states in Greenland and along the Canadian coast by 1500. If any of this nations is fortunate gunpowder based weaponry and assuming their metallurgy skills does not degenerate will virtually guarantee their survival to 1700. Maybe there could even be a unified Greenlandic nation by this period. likely spurred on sparked by the rise of these new colonies.