I just caught the tail end of an episode of Family Guy in which Lois kidnaps the infant son of Christian Scientist neighbors to take him to a hospital for medical treatment. The episode ends with an impassioned speech outside the hospital in which Lois wins the Christian Scientist parents over with a theological argument: If you’re praying for God to heal your child, doctors and medicine are the answer to your prayer!
The closing speech is presented as a perfectly serious rebuttal to Christian Science: the writers had to inject comic relief into the preachy moment by having Peter comment on the fact that the speech wasn’t comedic. (“So far, so good, Lois. Now try to work in some laughs.”) Apparently this was an issue on which the show’s creators wanted to weigh in.
The same episode included a cutaway gag about Seventh-day Advenists: A Methodist and an Adventist are standing on a street corner. The Methodist explains that he believes in Jesus Christ, etc. The Adventist says: We believe the same things you do, except we worship on Saturday. The Methodist does an absurdly exaggerated double-take (eyeballs leaping out of his sockets) and beats a hasty retreat.
Note that where the cutaway gag satirizes a negative mainstream reaction to a minority religion (Seventh-day Adventists), the thrust of the plot overall is to reinforce criticism of a different minority religion (Christian Scientists). In the moment leading up to the SDA cutaway gag, Lois makes a comment along the lines of: I’m beginning to think that Christian Scientists are a lot crazier than Seventh-day Adventists. It would seem the writers agree.