Not sure if it counts as psychology of religion, but "Orthodoxy" by Gilbert Keith Chesterton is something not to be missed if you are looking for one of the fin

Not sure if it counts as psychology of religion, but "Orthodoxy" by Gilbert Keith Chesterton is something not to be missed if you are looking for one of the finest works of christian philosophy in XX century. some quotations here https://en.wikiquote.org/wiki/Orthodoxy_(book) https://en.wikiquote.org/wiki/Orthodoxy_(book). Quotations from the chapter I, "Introduction in Defense of Everything Else", might be exactly what you are looking for.