Augustine's Advertisement

Saint Augustine may have written this autobiography for many reasons. However if we go with the idea that he wrote this as a form of advertisement, than there is one reason that jumps out at me for why he is presenting himself in this way. Saint Augustine is trying to prove through his own actions why the Catholic faith makes sense. I feel he does this in a distinct way.
The first way that Saint Augustine uses his autobiography to sell the idea of Catholicism is through the idea that any sinner can turn to the faith. He does this by showing how he was a “terrible” sinner in his past. This is why he stresses over the incident of stealing pears. He is trying to get across the message that even sinners who sin for no reason but the fact that they want to can still convert to the faith and be forgiven by God.
I feel this reason is contributing to the main focus of the autobiography, which was to get more converts to the Catholic religion. The idea of a sinner being able to convert and still be saved was very appealing to the readers. I feel this book is intended to bring people who are scared about their afterlife to the Catholic Church by preaching that forgiveness is granted by God to people in the Catholic Church.