The Lord Jesus said that we will know a tree by its fruit: "Either make the tree good and its fruit good, or else make the tree bad and its fruit bad; for a tree is known by its fruit" (Matthew 12:33).
Jesus is making a point about a person's heart.
Whatever is in the heart comes out.
If one has an evil heart then the fruit will be evil.
If one has a good heart, that is, a heart transformed by Christ, the fruit will be good.
We can make an application to the discipleship process.
If our process is not in line with Scripture, then we cannot expect to bear the good fruit of genuine or mature disciples of Christ.
If the process is biblical, then we can expect the good fruit we desire.
Upon examining the fruit of our discipleship process (two-million young people per year lost; only nine percent of Christians maintaining a biblical worldview), we can clearly see that the process itself is faulty.
Using the analogy that Jesus used, the tree (faulty discipleship process) is bearing bad fruit and leading millions to apostasy.
We are not negating the role of God in the salvation of children.
But, the Bible is clear that parents have a responsibility to follow Christ.
From our side of the equation, the solution is really quite simple: make disciples like Jesus did! If Christian parents will begin following Jesus' model of making disciples their fruit will look much more like His fruit.
And, also like Jesus, they will retain their fruit.
This is your calling; you must disciple your children like Jesus.