Christian simplicity-based religion locates true devotion in the heart.

Evidence

It is the first appearance in literature, so far as I know, of the view set forth in Rousseau’s Savoyard Vicar, according to which true religion comes from the heart, not the head, and all elaborate theology is superfluous. … It is, essentially, a rejection of Hellenic intellectualism by the sentimentalism of the North. — Bertrand Russell, History of Western Philosophy, 1908

Categorization

• XREF: XREF connects to the intellectual shift toward sentiment and faith over scholastic reason.
• corroborated: 2 independent passages support this claim — Bertrand Russell, History of Western Philosophy, 1908