I'm saying that you wouldn't have known about the Satanists or any other religion unless an adult told you about it. I'm opposed to preaching to kids.
I'm also a parent (though my kids aren't yet at school age) and I'm frustrated with how public schools have become a battleground for the political gain of warring groups. A Satanist after school club is another example.
You mentioned that you went to private school. I also went to a Catholic private school until third grade so I understand your frustration with them.