Infant Christians are not apostate, but rather immature. Forgive them.
You do not whip a 7-year old child for their inability to drive a car. Instead, you teach them to read. You drive the car for now.
The idea that turning to Jesus Christ instantly flushes all sin and immaturity from your life is a revivalist myth. When you are born again, it is as an infant, not a fully formed adult. Do not despair when you continue to wrestle with destructive habits established over many years. To do so simply puts you in league with Saint Paul. Christ brings grace to you. His kindness leads you to repentance. His grace can and will motivate you to turn from your ways. The Holy Spirit sometimes affects us in quick and dramatic ways. Glory. But grace is secured before all this, by his work, not ours.