Look up the Holy Face Devotion. Jesus appeared to Sr Mary of St Peter and gave her prayers for the whole world to say against taking God’s name in vain, aetheism, communism, bad language, and misuse of holy days and Sunday.
St therese the little flower was devoted to this devotion her whole life and said it was the source of all her virtue.
The popes have approved it and the prayers. There is even a Holy Face chaplet, litany, confraternity,
It is all written in the book ‘The Golden Arrow’ Tanbooks (the diary of sr Mary of St. Peter)
The prayers are to be said on Sunday (and Tuesdays).
See this website to copy and paste and print the prayers. Or order a little holy face medal, prayer leaflet and chaplet.
www.holyfacedevotion.com
www.holyface.com
Jesus told her if we hear a curse: to say (in our heads) ‘May the Holy Name of God be blessed. Begone satan.’
There is a little Holy Face medal to be worn also which has a promise from Our Lady. And there are 7 promises attached for those who say the prayers. After the rosary and divine mercy these are my favourite prayers.
Google Holy Face devotion.
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I think you could say in a kind laughing manner; ‘Hey friend, don’t take the Lord’s Name in vain! It ain’t good for you!’
However the bible says ‘Don’t cast your pearls on swine less they trample them underfoot and turn and devour you.’
In other words , they may not care what you say and treat you and your advice badly.
The bible says correct a person 2. Or 3 times, if they don’t listen it’s their decision unfortunately
If you do not think they will listen -maybe just pray about it