In Quebec French, the general motif for swear words is to use church related terms [0].

Common examples:

* câlice [kɑːlɪs] (calice): "chalice"

* ostie [ɔs.t͡si] (hostie): "host" - as in sacramental bread

* tabarnak [ta.baʁ.nak] (tabernacle): "tabernacle"

[0]. https://en.wikipedia.org/wiki/Quebec_French_profanity?wprov=...