The #1 reason most new believer follow up doesn't happen is because we didn't think through how to get the contact information of those who made decisions to follow Jesus.
At Calvary, we love using the Connection Card because it gives a person the opportunity to check off that they prayed to begin a relationship with Jesus. Then when we collect the cards at the end of the service we can follow up with those who made a decision.
That's why you have to think through your invitation style, so you can ensure you're getting the contact information. Because the reality is, people are most likely to stay at a church where they are followed up on.