An Introduction to the Study of Comparative Religion is a religious studies classic by Frank Byron Jevons.
The use of any science lies in its application to practical purposes. For Christianity, the use of the science of religion consists in applying it to show that Christianity is the highest manifestation of the religious spirit. To make this use of the science of religion, we must fully and frankly accept the facts it furnishes, and must recognise that others are at liberty to use them for any opposite purpose. But we must also insist that the science of religion is limited to the establishment of facts and is excluded from passing judgment on the religious value of those facts.