well, yes in one way, but more in nationalistic way history is written.
look at my post
492
you can see that Dushan is talking about Bogumils (Krstjani) as major religion in Bosnia, and Catholicism as main, but by the Pope power. Definitely breaks theory of orthodox as main religion in medieval Bosnia by Serbian nationalist. Still, it is said that one part of Bosnians are orthodox
And he speaks of Bosnians as brothers by language they speak, so not heritage
I'm just speaking as the realist, not nationalist. I love Serbia, I am Bosnian Serb, but I must say that medieval Bosnia has it's own history, not like some Serbs or Croats says that it was part of Serbia or Croatia (well it was in some centuries, but as conquered realm). Still, I can't deny that there we're no Serbs and Croats. There were, for sure, many of vlastela were Croats or Serbs, Bosnia was always and is mixed nation and religion area, cause it was on border of different religions and nations through the centuries