there are really people who think that D&D did exactly what Chick claimed, that believe that there was satanic backmasking, that they are involved in spiritual warfare. I personally knew/know them. There may be liars like Chick who use such nonsense to convince people to obey them, but there are plenty more who accept such crap as true.
I know that for sure to be true. I enjoyed D&D in High School and even as a middle aged dude, I still run a pretty good campaign.
It's not something I usually talk about, because some people still think of D&D players as fat guys with neck-beards who have poor hygiene and live with their parents at age 40, and, I don't fit into that stereotype. I'm at the gym a lot more often than I'm rolling up NPCs and encounters.
But it's a fun game, and I'm a fairly well rounded person with a lot of interests.
However, I remember my own superstitious mother was influenced by Jack Chick and some of the evangelicals trying to lash out against D&D in the 1980s. It was so bad that, the 2nd edition literally renamed devils and demons in the monster manual to try to lessen the backlash.