Religion: Christianity - Jewish Virtual Library
The History of Western Religion | Locust blog
To identify religion with the activity of Satan will seem to be blasphemous to those who have not differentiated between Christianity and religion. Once that distinction has been clearly made however, the antithetical alternative to Christianity that takes place in religion will of necessity be identified with the activity of the Evil One.
Religion | The Judeo/Christian Tradition
In his masterful presentation of diabolic activity, C.S. Lewis has the senior devil, Screwtape, say to his nephew, Wormwood, "One of our greatest allies at present is the church itself," i.e. "Christian religion." In another vignette Screwtape explains that "it will be an ill day for us if what most humans mean by 'religion' ever vanishes from the Earth. It can still send us the truly delicious sins. Nowhere do we tempt so successfully as on the very steps of the altar." Blaise Pascal likewise noted that "men never do evil so completely and cheerfully as when they do it from religious conviction."