The Holy Trinity: Player's Handbook, Dungeonmaster's Guide, Monster Manual. Pay close attention to the covers, they hold alchemical and occult symbols such as the All-Seeing Eye, Eastern Star, etc.
I think these people are mad once D&D revealed to them that it will be rules-lawyers who will master the universe. They clearly have come to understand that Rules Mastery is the true path to occult power, but apparently could not achieve that power. So you are likely correct, Blackleaf is based on Jack Chick's own D&D experience! He failed to achieve rules mastery and true character optimisation, thus revealing a weakness that showed the DM that he did not have the nessessary appitude for true wizardry. So Jack got kicked out of the group, yes it seems to all make sense now...
Here are some quotes I liked:
"Our souls we will have forever, and what if they have been destroyed by playing D&D?"
"D&D is an extremely challenging game intellectually and emotionally"
"He is also pretty ignorant about hard-core occultism, as mentioned earlier, when he mocks the Necronomicon and claims it is entirely fictional"
"It has never been our contention that D&D alone turns people into drooling demoniacs"
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An interesting note, the guys writing these are like self-proclaimed High Priests of the church of Satan. Yes, interesting to say the least, hmm....
