What correlation does Huck make between the story about the lamps and genies, and Sunday School? (CH 1-6)

The only real escapade Tom's band of robbers indulge in is ruining the Sunday School picnic, where they chase some of elementary school children away. Tom pretends that during this 'battle' there were Arabs and elephants and that the boys were attacking a large army, but Huck is too practical to follow Tom's fantastical imaginations. When Huck asks why they could not see all the elephants, Tom explains that some magicians must have turned the whole army into a Sunday School picnic. Tom then tells Huck all about genies in bottles, and how the genies must obey whoever rubs the bottle. Huck gets an old lamp and tries to find a genie, but when it fails he decides that the genies were just another of Tom's lies.