Saints have been given visions of Jesus, Mary, Saints, heaven, hell and purgatory.
St Dom Bosco was brought into Purgatory and it was so beautiful, he thought he was in heaven.
Some Catholics, especially traditional Catholics, would’ve believed the boy if he was Catholic and only saw hell and Satan instead of heaven and Jesus.
He was an four year old innocent non-Catholic, who was given a gift of seeing Jesus and Heaven, and they blow him off. His experience brought people around them closer to Jesus, especially his minister father who struggled with it all. In fact, his father’s faith seemed to be on an intellectual basis before his son began expressing his experience. It challenged the father, but in the end he realized that all he had been preaching from the Bible meant nothing without the experience of God’s love.
BTW, I have not read the book, but those who did, said he did know of Satan’s presence but Satan was suppressed because he was with Jesus.
Don’t know about this, but a person who read the book had told me about it.
Jim