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I never agreed with my parents' religion but I wouldn't dream of knocking it.
— Rimmer • Red Dwarf

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Disagreeing with a religion is separated from attacking it. The speaker allows the difference of belief while ruling out a more dismissive response, drawing a boundary in how that disagreement is expressed. The mention of parents gives the distinction a personal setting without explaining the beliefs themselves.
Context reviewed