"she is an atheist as far as I knew"
Wealthy mother-of-two Erin Patterson is in custody after her privileged life unravelled when her marriage collapsed and she allegedly served a fatal mushroom lunch.
www.dailymail.co.uk
Although this appeared in the Daily Mail, it is not where it originated. It came from an anonymous post in a forum following EP's case.
It was stated by a person who anonymously declared themself as an "ex" friend of EP's. Ex because they had a falling out. As a member of the true crime groups of which EP and the anonymous person were members I'm familiar with them both in that context.
In the EP forum the anonymous person stated they had not met EP in person. In other words they knew EP on-line, not in real life. As we all know people can present themselves on-line in the way they wish to be perceived.
It is my opinion therefore - the anonymous on-line ex friend would not know if EP was an atheist or not.
In the linked article (subscriber only) a Korumburra local is quoted as saying when EP was editor of the Burra Flyer she pushed a religious agenda. This contradicts what has been stated by the anonymous on-line ex friend.
https://www.heraldsun.com.au/subscribe/news/1/?sourceCode=HSWEB_WRE170_a_GGL&dest=https://www.heraldsun.com.au/truecrimeaustralia/police-courts-victoria/erin-patterson-believed-to-be-reading-and-reciting-bible-verses-in-prison/news-story/a348ba9904ba0b252054fe27a57e0e4d&memtype=anonymous&mode=premium&v21=HIGH-Segment-1-SCORE
All said in my own opinion.