When I was 12, (12½), for some reason, despite her disapproval of organized religion, my mom decided to send me to "Vacation Bible School" that summer -- kind of like a Bible day camp, at the Methodist church down the street. I don't know what her reasons were.
They taught out of the Bible as promised. I remember learning about Noah's Ark and the promise of the rainbow, but I do not remember if they were overtly adamant about us accepting this as literal science or history. Maybe nobody would have asked that question in that group at that age.
When I came home asking questions about things like the Trinity that the bible school teachers had tried to explain, mom and grandma told me to ask my grandfather, who railed against it. Also, later I asked for a Bible of my own and reported believing some of what I learned. I think my mom was not expecting that. (Though didn't she always tell me to have an open mind?) It all seemed really important though too, and the bible teachers seemed so confident and passionate about the things they were explaining. I knew not to agree with all of it as I had learned different things from my family, and had read a lot, but going to the Youth Group at least threatened to be fun, and I thought it was important to try to agree with at least some of what the denomination taught to take part.
I also asked to be baptized when I was - somewhere 13-15.
My mom always said she would never stand in the way of my beliefs, only insisted I never push any beliefs on her.