There is no Ilyrian gene buddy. There is I2a2 that is most likely in area since last ice age that is some 20 000 years, so thats a lot longer than we have Ilyrians around. Besides Ilyrians werent a single cohesive group. They were numerous tribes who significantly mixed with Celts in north and west and with Thracians in east and south. So for example Dardanians in modern Macedonia are classified both as Thracians and as Ilyrians. Scordisci in central Serbia were mix of Celts, Ilyrians and Thracians. Ilyrians in northern Epirus and Montenegro were heavily Helenized. Ilyrians in Croatia and Bosnia were also heavily mixed with Celts especialy Pannonians in modern Croatia who were more Celtic than Ilyrian. Histrians and Veneti were also somewhere between Ilyrians and Celts but even more a single group in their own way. From earliest known time, Balkans were and are heavy mix of all kind of groups.
What about it? Heretic movements were historical reality since the beggining of the Church. At the same time when Bosnian rulers are protecting heretics, same those Patharens and Bogomils are being prosecuted in Bulgaria, Byzantium, Serbia, Italy, France, Germany, Spain and Hungary. In fact first Patharens mentioned were ones in coastal Croatia in region of Dalmatia who then fled to Bosnia.What about Crkva Bosnanska?
So that heretic movement was at the time very spear in all of Europe. It survived in Bosnia longer because Bosnians rulers at first protected it, and later when they converted to Catholicism the movement was too strong. But because this movement was prosecuted so much, it is possible that their members were more willing to convert to Islam when Ottomans finaly came.
What about Bosnian kingdom? There was also Kingdom of Diocletia. And Kingdom of Slavonia. And Kingdom of Dalmatia. Does this mean all of these tiny regions are nations in their own right?