Is it a sin to take part in a non-Christian worship service?

[CutlerB]

I have attended multiple Jehovah’s Witness meetings, even saying an Our Father and singing some of their songs (though omitting stuff I could not agree to) at them. Is that a mortal sin, or does it fall under the First Commandment?

 

[Devon_Caffran]

These links should give you the answers that you need. If you have any further questions or concerns that are not answered by this, please [contact Catholic Answers (http://www.catholic.com/home/contact.asp) directly.
**Recommended Reading:
**

• Are non-denominational Bible studies ok for Catholics?
• Is it okay to attend a Protestant Bible study?
• Why can’t we evangelize at a Protestant Bible study?
• Is it a sin to worship in other Christian churches?