how much does the Moral Majority and other Fundamentalist groups contribute toward the preservation of childhood?

MY opinion. They have no relevance to the preservation of childhood.

How parents take responsibility for raising a child is what makes "childhood". If parents provide a secure home, encouragement to grow and learn responsibly, an example of concern for others who occupy this world with us, honesty and integrity, then a child will grow into a well rounded adult capable of making a positive contribution to society.