formalist

An overly formal person, especially one who adheres to current forms; a stickler

The Besht preached that the simple man, imbued with native faith and able to pray fervently and wholeheartedly with a sense of joy in his heart, was nearer and dearer to God than the learned but joyless formalist spending his whole life in the study of Talmud.

An advocate of formalism

Of or pertaining to formalism; formalistic