I dunno about that. Buffy the Vampire Slayer’s Seasons 5 and 6 were positively Christian, but Season 7 was just one big anti-Christian tampon commercial.
Not quite a running gag, but worthy of note:
Three regulars from Roseanne became at least recurring characters on BBT.
Leslie Winkle was Darlene Connor, Rosanne’s daughter.
Leonard was Darlene’s boyfrield-then-husband, who lived with the Connors.
Ms. Cooper was Roseanne’s sister.
Since I’m not sure I’ve ever seen an episode of Buffy all the way through, I’ll have to defer to your expertise.
However, I would like to point out that it isn’t reasonable to expect Christians or conservative Christians to always be portrayed favorably, anymore than it is to expect any group to always be portrayed favorably. And there are certainly villainous Christians just as there are villains in all other groups.
What I object to is the very nearly constant denigration of Christians in programming, which is not the case for other religious groups. In fact, negative portrayal of Muslims has somehow become classified as racism.
So why isn’t constant negative portrayals of Christians racist?