My money is on The Kid’s statement of Molly’s death in the past tense having something to do with the mysterious schisma.
If the schisma is connected to Molly’s “death,” then it stands to reason that The Kid is referring to the death of a different Molly, either because he has the ability to see into various other realities (and thus convinced Dale Lacy that he was the devil) or because he visited/comes from a different reality.
Henry’s father believed that it was the voice of God speaking to him, but the deaf scientist/madman Henry encountered in the forest believed that the schisma is actually the result of the universe trying to reconcile multiple timelines, with the effects being felt in places where the membrane between various realities and timelines is thin.