I agree with you, be there. It's all about controlling what you teach the children. At school, they get a total mix of morals and values and if they get a quacky teacher that is sort of 'loose,' in wha they believe, then it can pose a huge problem.
If you're good in character, then obviously your kids will follow your tune. Then, it'll shine through as they mature and develop.
Being a parent is the toughest job in the world...