Another good title for this movie might have been, "What Louis Learned," because that's basically what the action of the plot entails. Louis isn't a child with an easy life. He understands that there is suffering, because he has already suffered. His father abandoned his family, and although he and his mother are loving, he can't forget that life robbed him of a parent, so to speak. Then, he meets a family whom fate has robbed of a child through miscarriage, and he gets to observe a similar plot from the third person.
His new perspective comes at the cost of his innocence. When he sees how painfully tragic life has been for Marcelle and Pelo, he is disturbed. After Pelo's violent outbursts, he sees the damage done to their mental health and their marriage by an accidental miscarriage. He sees that Pelo wants to blame someone, so he sometimes blames himself and sometimes, when he's drunk and angry, he blames his poor wife.
The revelation is overwhelming, and it drives Louis to God. However, his suffering makes him unlike the rest of the parishioners. He doesn't go in the church; he goes above it. This is a symbol for his path in life, because his suffering entitles him to a higher revelation than religion and church typically offer. His direct experience of suffering makes the roof of the church into his solace, and he can look up in the skies and ask God in his quiet, childlike way how such a being could allow such horror and agony. He has officially transferred from innocence to experience, and the cycle is truly complete when he sees a new child: Marcelle and Pelo's child, a new avatar of innocence.
