Here's An Earlier Paper On the Evil God Challenge

It was published by Steven M. Cahn, “Cacodaemony,” in Contemporary Philosophy of Religion, ed. Steven M. Cahn and David Shatz (New York: Oxford University Press, 1982), pp. 20–24. This paper was previously published in 1977. Cahn shares the parallels between an omnibenevolent God and an omnimalevolent Demon. Then he compares John Hick's "Soul Making" theodicy with a "Soul Breaking" theodicy. I couldn't find the text but here is a reading of it. I found it better to turn off the sound and read it myself, but see for yourselves.