romania is a secular state. this means romania has no national religion. the biggest religious group in romania is the romanian orthodox church. it is an autocephalous church inside of the eastern orthodox communion. in 2002, this religion made up 86.7% of the population. other religions in romania include roman catholicism (4.7%), protestantism (3.7%), pentecostalism (1.5%), islam (1%) and the romanian greek-catholicism (0.9%).