Here are the five principles suggested by Lisa Price (with which you may agree of disagree):
1. Create routine and embrace tradition
2. Shelter their kids
3. Have fun together
4. Teach the Bible and apply biblical principles to real life situations
5. Communicate honestly
Yet, keep in mind that, in virtue of the gift of free moral agency, there is no absolute guarantee that, after we have have done everything we needed to do as parents, our kids would turn Christian 100% of the time.