Some private schools in Florida that rely on public funding teach students that dinosaurs and humans lived together, that God’s intervention prevented Catholics from dominating North America and that slaves who “knew Christ” were better off than free men who did not.The lessons taught at these schools come from three Christian publishing companies whose textbooks are popular on many of about 2,000 campuses that accept, and often depend on, nearly $1 billion in state scholarships, or vouchers.