In the Balkans we are genetically all pretty same people and hard to tell who's Croat, who's a Muslim and who's a Serb just buy looking at them. Except for one little detail, Muslims were always cut.
Also, Serbs are Eastern Orthodox and believe in one single God, composed of three separate entities.

During the Balkan war we had a joke when a Serbian soldier ( uncut Orthodox) catches a Muslim soldier who's pretending to be Serbian.
The Muslim is begging for his life pretending to be a Serbian but the soldier is not buying it and orders him to drop his pants.
The Muslim cry's out "Brother of mine, who do you trust more, your almighty Lord or the head of my cock?

And then we all laugh because we're Yugoslavians.