Section: Imitating Them in Matters Outside Our Sacred Law
Imitating them in matters that do not come from our Sacred Law falls into two categories.
The first category is when one acts with full knowledge that the practice in question is among the distinctive rites of their religion. Such a practice—precisely because it is peculiar to their faith—may be undertaken merely to comply with them (and that is rare), or out of a personal desire connected to the practice, or due to a specious notion that it brings benefit in this world or the next. All of that is unquestionably forbidden; in some cases the prohibition rises to the level of a major sin, and according to the legal proofs it may even constitute unbelief.
The second situation concerns an act whose performer does not know that it originates with them, and this divides into two kinds. The first is what was originally borrowed from them, whether it is carried out exactly as they perform it or with some alteration in time, place, form, and the like. This is what the general populace is most often afflicted with—such as the practices they observe on the so-called “despicable Thursday” and in birthday celebrations.