It would be very reasonable for that scientist to demand worship. But then two lab interns and a janitor would come over and demand worship, and pretty soon all the little Kewpies or whatever the scientist calls them are killing each other over who's worshiping the right human.
So you'd have pretty much what Earth is, only with all gods being real, but only one all-powerful. So really, after the scientist returned and saw what was happening, he'd totally have to kill the interns and the janitor in front of the kewpies* to return them to him as followers. And then he'd have to slaughter the non-believers to prove his point.
Of course after a long time, the kewpies would learn that they were created not by divine power but by a more advanced version of their own science. This revelation would destroy their power structure, resulting in yet more war, which would probably lead to the destruction of the holding cell. The outbreak would reveal the world to them, which would certainly lead to mass apostasy.
Even worse, as the apostates learned more about science, they would begin to hate their creator, and would kill him. Having killed their creator, they would probably go to war with all beings like him and kill them.
Then, having run completely out of things to do, they'd sit around smoking pot.
*I heard the word "Kewpie" in a book called Steel Beach, where it was used to mean miniature humans created to be pets and dolls, possessing only a fraction of a real human's intelligence. I figured it'd apply here.