Different families and different religions have different customs, but in my case, I began my religious education in the Catholic faith when I was in the second grade of elementary school. The classes were held at our church on Wednesday afternoons. I continued them until the end of high school.
On Wednesday afternoons, the school bus would stop in front of the church, and all of us Catholic kids would get off and go into the church for our lessons.
The nuns (修道女) very patiently taught us children. We learned prayers and sang songs. We performed a Christmas Nativity play (キリスト降誕劇) every year at Christmas Eve Mass (ミサ）, so we practiced and prepared for that. And we studied and prepared for the sacraments. I don't know how to say sacrament in Japanese. But it's a very common word for Catholics. Do you know the famous city in California called Sacramento (サクラメント）? That name comes from the word "sacrament".
I looked it up (調べた）on the internet:
I was born in a Catholic hospital. The hospital gifted each new baby with a Bible (聖書), with their name printed on it.
(Look! It's so old!)
After high school, I went to a private Catholic university. Some of my university professors were Catholic nuns (修道女).
My Catholic education is one of my most valuable possessions (財産）. I thank my mother for making sure I got that education. There were many times as a child when I thought it was boring (面白くない). It wasn't especially fun. At that time, I would have preferred to spend Wednesday afternoons with my friends, or reading a book at home, or watching TV. But my mother made sure that we got our religious education.
Thank you, Mom!