I didn't listen to The Twilight Kingdom before listening to Faith Stealer so I was definitely missing some character continuity at the beginning but it wasn’t too much of an issue.

I enjoyed the central idea of a religious stock market where religions rise and fall in members on a moment by moment basis - people being easily converted. Like most of these divergent universe 8th Doctor stories it lives in a slightly bizarre, uncanny realm. I think it does enough to feel distinct from the main universe.

It’s not particularly deep but there is a frivolous and fun “RTD era” feel, notable as it’s from late 2004. It reminds me a little of Gridlock in tone.