Oooo, verrry bad in French Québec. You're right though, swearing does not translate well into other languages. Essentially, these are religious things, the host, the tabernacle and the chalice, but they are used as angry swear words. You have the same thing in English with Jesus Christ. It is a highly regligious name but, used in anger and said with vehemence it is a swear word.

I was teasing though about what we French call the green onions. In French we don't really have a nic-name for them but the usual reaction to seeing them near your car IS swearing