The problem I have is knowing the difference between an incredibly powerful alien, or god. Put another way--what if one day we advanced to the point of being able to create a universe ourselves. Would we be morally just in requiring or even desiring that those independent sentient beings present within it to worship us? Would simply being the creators of said universe grant us any moral say in their actions? Would it be just to claim we could send them to suffer for eternity for eating shellfish? Might cannot make right. I don't think any being can truly be worthy of worship.
Nonetheless, I think your answer cuts to the heart of the matter: show us the evidence and we will accept it.