To be clear, I don't think she wasn't being sincere in any of these.
- During an appearance on "Saturday Night Live" in 1992, the Dublin-born singer tore up a picture of Pope John Paul II
- In 1999, she was then ordained as a priest by a breakaway church in France. After her ordination, O'Connor said that she wished to be called Mother Bernadette Mary
- "I'm sorry I did that, it was a disrespectful thing to do," she said, according to the BBC. "I have never even met the Pope. I am sure he is a lovely man. It was more an expression of frustration."
- In an interview with The Guardian later the same year (2010), she labeled the Vatican as "a nest of devils and a haven for criminals." "Do we need a fucking pope? Why do we need a pope? Christ doesn't need a representative," she said.
- In an open letter to Pope Francis in August 2018, O'Connor asked to be excommunicated from the Catholic Church.
- In a statement on a since-deactivated Twitter account in October 2018, O'Connor said she had "become a Muslim."
- in September 2019, O'Connor said that she "had been a Muslim all my life and didn't realize it."
[1] https://www.insider.com/sinead-oconnor-islam-muslim-shuhada-...