Somebody correct me if I am mistaken, but I think as a shamanist you have the option of offering to be force converted to Christianity by making peace with a Christian nation?
Also, two questions:
- is there any scenario where taking the Ecumenism/Humanist Tolerance NIs are worth it? It seems like getting Divine Supremacy and converting them would be the better choice every time.
- is it ever worth it to move the Land/Naval slider towards Land? I like the land bonuses it gives, but the rather hefty penalty to tariffs makes it seem like a bad choice in the late game, where even land powers can expect 'overseas' provinces.