I lost my faith on a foreign shore, in the shade of the conscience tree. In the shade of the conscience tree, on a foreign shore, where the sand ran … - Darrell Schweitzer

The true horror story requires a sense of evil, not in necessarily in a theological sense; but the menaces must be truly menacing, life-destroying, and antithetical to happiness.

Were you not at the Holy City when the army of the faithful burst in? Did you not yourself partake in the slaughter of the pagans, and the women and infants of the pagans, those who were born in lands where the gospel never reached? Did you not do this and much more, all for the glory of God? And does not that same All Mighty and All Merciful God damn men for sins of weakness and ignorance when He himself made them imperfect and prone to weakness, and taught them not so that they remained ignorant? Did He not allow the serpent to enter the Garden, make no move to stop it, then punished severely his beguiled servants?"
"Lady, as you said, you know the answers. All these things are true."
"Then I ask you, Julian, are these actions of a loving God?"
"I—I—don't—"
"Know! But you do. This knowledge is the heritage of all men. You know they are not, and yet more shall you know. God is mad, Julian. He babbles on his throne of light, and the sound of his gurgling fills his angels with fear. He sends them forth with flaming swords to raze the cities of men, and when thousands upon thousands have been slain, and the smoke of their pyres rises into the heights of the sky, when pestilence and famine slay thousands more, then God laughs and roars like some mindless beast, 'THIS IS PLEASING TO ME!'"
"Why do you tell me these things? Why have I been brought here?"
"Because you are to join us in our war against the Father. He has grown weak in his madness, so preoccupied with dreaming new ways to torture men that he will not notice when the very gates of Hell fly open and the armies of his old Adversary issue forth.

One more thing I will tell you, the great secret I learned through my experience."
"What was that?"
"Never listen to idle tales. They make you mad and lead you through the bowels of a god."
"Of course," said one of the disciples after he had left, "it is the nature of the madness that one never heeds these warnings.