I found this and many other stories like it at the PZ Myers website.

https://freethoughtblogs.com/pharyngula/

https://freethoughtblogs.com/pharyngula/category/atheism-2/testimonial/

https://freethoughtblogs.com/pharyngula/2012/10/07/why-i-am-an-atheist-schwag/

Why I am an atheist – Schwag

I’m an atheist because of a nun.

I went to Catholic school, Kindergarten until third grade.

One morning, when I was in first grade, I was called to the front of the class by the teacher, who was a nun. Three or four other students were called up as well.

Sister told the class that she hadn’t seen us at church the previous Sunday. I don’t remember what her point was for doing it.

All I remember thinking is ‘This is bullshit.”

I was 6 years old.

Don’t get me wrong. I didn’t have an epiphany. But it got the ball rolling.

Schwag