I’ve been involved with creation ministry for a number of years and know firsthand how difficult it is to speak in science classes in a public school. If they do allow you to speak, they generally place strict guidelines on you. You’re not allowed to say anything about the Bible, Jesus, God, creation, or intelligent design. I’ve seen schools go so far as tell you that you aren’t even allowed to question evolution for fear that someone will take it as a creation talk and the school will get sued.
Likewise, history classes are the same way. I once was invited to speak about America’s early history, but was told that I couldn’t mention anything about religion whatsoever. I informed the teacher that you cannot truthfully teach American history without religion as it played a huge role in shaping the nation and helping us gain our independence from Great Britain. Consequently my invitation to speak was withdrawn.
Public schools throughout our country are so afraid of lawsuits that they’ve turned to teaching history that has been sanitized against all religious references. They’ll teach that most all of our Founding Father were deists, which by the way is not correct, but that’s as close to religion as they’ll get.