Страшно впасть в руки Бога живого!
It is a dreadful thing to fall into the hands of the living God.
It is a fearful thing to fall into the hands of the living God.
It is a terrifying thing to fall into the hands of the living God.
It is a terrible thing to fall into the hands of the living God.
It is a fearful thing to fall into the hands of the living God.
It is a fearful thing to fall into the hands of the living God.
[It is] a fearful thing falling into [the] hands of [the] living God.