Convention play is an interesting thing to look at, but I would not expect it to represent much of anything. Lots of people (such as myself) have ever played at a Convention, and I would imagine one would be inclined to play something different at a Convention than one does regularly at home, or...
Yup, a lot of Sci-fi D&D these days. Legends of Avantrisvis flooding my socials with ads for a new Sci-fi 5E project coming to Kickstarter soon, Neon Odessey, looks like another multi-million crowdfunding contender:
https://www.kickstarter.com/projects/legendsofavantris/neon-odyssey
Is Weis also Mormon? I looked and haven't found any info on that, though it seems plausible enough. She isn't outspoken the same way if so.
It is true that different Christian groups differ on a number of things, but a love for Horror as a genre is pretty widespread ecumenically in my observation.
I'm not sure about Weiss religious beliefs, Hickman is the devout Mormon. Christians of various stripes tend to be huge Horror fans, historically. Horror is traditionally about morality tales being played out as tragedy.
That was actually Hickman's main beef with 2E Ravenloft that he...