holy roller

Translations
фанатично религиозный человек
She was considered a holy roller by her friends due to her fervent religious beliefs.
Ее друзья считали ее фанатично религиозной из-за ее пылких религиозных убеждений.
Definitions
A 'holy roller' is a slang term, often used pejoratively, to describe a member of a Christian group, especially Pentecostal or charismatic denominations, who displays very emotional or ecstatic forms of worship, such as shouting, dancing, or rolling on the floor.
Words
holy

adjective
религиозный
roller

noun
фанатик