The Bible teaches that God created all things in six literal days. Public schools teach that ethics are evolving, that society or the majority determines what is acceptable behavior. The Bible says that the moral law is based on God's nature and is unchanging, absolute, and non-negotiable. The Bible teaches that man is born with the guilt and pollution of sin and that every transgression of God's law is evil. They also strongly condemn many fundamental doctrines of Christianity such as Christ's exclusive claim to be the way to God, the Biblical view of the family, and so on.
Public schools have no real foundational basis for teaching ethics.
Only the Bible gives real, logical reasons why cheating, theft, rape, sexual immorality, and murder are wrong. Public schools espouse a secular humanistic, neutralistic, pluralistic, relativistic anti-Christian philosophy that contradicts Scripture at every fundamental point. Parents simply cannot be faithful to the Biblical commands to instill in their children a Christian world and life view if they send their children into the Satanic lion's den of public education. Every thought is to brought into captivity to the obedience of Christ, not to the obedience of the heathen state. It is contact, association with evil, that is declared to be corrupting.