Brothers and sisters, I could not address you as people who live by the Spirit but as people who are still worldly—mere infants in Christ. 2 I gave you milk, not solid food, for you were not yet ready for it. Indeed, you are still not ready. 3 You are still worldly. For since there is jealousy and quarreling among you, are you not worldly? Are you not acting like mere humans? 4 For when one says, “I follow Paul,” and another, “I follow Apollos,” are you not mere human beings? 1 Corinthians 3:1-4
When somebody turns their life over to Christ, they begin learning the principles of Christianity bit by bit. There’s a tendency to overwhelm someone with much more information and theology than that person is ready to handle. That’s why a mentor has to help with the long term in mind. Otherwise it can be overwhelming. Once overwhelmed, the new Believer gets frustrated and give us up.
But the Christian life is certainly not a sprint but a marathon. New Believers especially need to be patient with their spiritual growth.
If you know a new Believer, encourage him/her to keep pressing ahead little by little. Come alongside and assist if you can. For some of you, you may be able to pour yourself into their lives.