Ironically, a large amount of the american stars are not technically real either. They use alias's a lot of the time.
Yet you guys worship them also. Hell People even worship authors/ book characters in the US. I would rather worship a hologram of a computer made singer than worship a character from a book. You are thinking it is odd that they do it. They are different than us, but still similar in some aspects. What do you expect, when its two very different cultures you are comparing.