Did you know that I used to think that women got pregnant from the priests words at the wedding?
Since you no longer believe that, what do you believe now?
I think that women get pregnant from a guy's sperm.
We all think some pretty foolish things when we're kids.  Learning how the world really works is part of growing up.  At least you know better now!
I'm an adult now and sometimes I still think that women can get pregnant from a guy's speech.
It is fine to sometimes believe quirky things, especially as a child when you're still learning. That's how we all grow and learn about life.