PODGORICA, Montenegro—Montenegro police used teargas to disperse hundreds of people protesting against the enthronement of a Serbian Orthodox Church cleric as the nation’s religious leader on Sunday, a ceremony that has exposed deep divisions over ties with Serbia. The demonstrators in the town of Cetinje had thrown rocks, bottles, and firecrackers at police as church figures were flown into the town by helicopter, news site Vijesti reported, but there were no reports of injuries on either side. The enthronement of Joanikije II as the church’s top cleric in the country, known as the Metropolitan of Montenegro and Archbishop of Cetinje, was being held under heavy security in a monastery in the town. The protests reflect tensions in the Balkan country between those who advocate closer ties with Belgrade and others opposing any pro-Serb alliance. Montenegro left its union with Serbia in 2006 but its church did not become autonomous and remained …