Draco Malfoy was not religious. As a proper wizard, whom he certainly was, he was groomed with certain expectations, one of which was to scorn anything related to muggles. The Christian faith was definitely on the list. Thus, being every bit of a true wizard Draco had never had enough patience for filthy preachers piously bleating about one true god, his angels in the heavens and demons in the hell.
However, watching the approaching Fiendfyre the wizard was ready to beg and pray, cry for mercy and relief. The clutching flames of the inferno were swallowing every bit of furniture littered around the Room of requirement and poisoning the air with black fumes of smog. Kneeling on unnaturally warm stones Draco was utterly alone in the bowels of the hell, as ridiculous as it might seem he could even feel the smell of grilled meat.
Must be my own flesh, he laughed and coughed feeling absolute terror. Bloody hell.
Draco lifted his head once again to see the last scene of his miserable life. In front of him, to his left, a black heap of charred bones was scattered around and enormous flames in shapes of dragon heads dived into what was left of his friend. He emptied his stomach, the wetness of his last dinner evaporated in seconds leaving the acid stench.
Poor soul, was his last thought as he was embraced by Fiend fire.
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Update: In hindsight, I should've expected it, but I chose to turn blind eye on the issue. But let me clarify it now. The author's perception of the world, religions and characters may be very different from that what I assume Draco might believe. Even when I put words into his mouth or thoughts into his mind, it does not mean "his" view of situation is correct or match my opinion or the actual reality, especially so when he is not in the right state of mind. And a half-caution/half-spoiler: the devil in the next chapter is not actually a devil, but a man. It takes a few paragraph to find out who that person is.