I think there's a lot of assumptions made in the hyphotesis in this thread that should be point out. And most of the assumptions are the result of difrent interpretations of a word.
Take
"nothig" . When we say we hold nothing in our hand, we actually do hold somthing (air molecules) in our hand. When we pull a bottle vacuum (= airfree) we still have something inside that bottle. Even empty space (the area of nothingness between stars and planets) is a materialistioc fabric. It's made out of higsparticles. And gravity bends this so called "empty" space.
(BTW, the space between atoms is very much finite. A line between to points cannot be infinite since the two points limit the lenght of that line. that's basic geometry)
So what is beyond the boundry of our universe. You say there is "nothing" beyond it. I say there is no "beyond" for your nothing to be present. What happens when we would forcly cross this boundery? Well we cant, the bounderey expands by the speed of light, so there's no cathing up on it, let alone pass it. What if hypotetically we could? Well my guess is, the matter you're build up of would disintegrate and be used to create empty space
in the "nothingness".
Edit: on second thought, this could be confusing, because there is no nothingness, otherwise it would be something. and if it's something, then your disintegrated energy would probably build that up to. Mast part is pure speculation of course.
Who cretaed the nothingness? Does nothing need creation when it's not there? Empty space was created by big bang. But nothingness isn't cretaed. If it were, it would outomaticly become
something rather then
nothing.
Can I ask you, given the same scenario. If the creation was a simulation run by alien supreme beings, would you accept them as "God"? and why not if you choose no.
There's a whole lot of assumptions lying in that question.
First of all We believe in the oneness of God, so that's an obvious obstacle in answering your question, so for simplicity I 'm going to answer the question as if you suggested a single alien, rather then a group.
Next important word: "creation". Creation can be interpreted in many ways. There's creation with full knowledge (big bang already calculated in that right now i would be writing this sentence, it all goes by a devine decreet (wich is the commonly accepted pov in islam). But then there's also weaker interpretations of creation. An impuls set loose to lead it's own life by luck. A scientific expierenment meant to produce data. etc...
Now if you repeat the quetsion considereing the devine decreet kind of creation, wich implies that what you call this alien is the creator, this entity is omnipotent, the one that planned and caused the events to happen, that made the qur'an, that granted us gifts and blessing more then we could ever count, and so on, yes then I suppose we would accept him. I mean, what's in a name. You call it alien, but by defenition anything that didn't origenate on earth is alien. So an entity that has no beginning at all would also be "alien".
Another interesting word choice is simulation. Is life real under this hypothesis? Are the promisses of the afterlife still standing. Is this simulation the test we are going to be judge for. Basicly is this just our religion with a lil twist. (Because in the end, all we know beside the 99 names of allah, is that e is beyond anything our mind can imagen, so let's keep an open mind).
Now; I know what your thinking. I took your question out of context, and I projected, tried to merge it with Islam. Some people might think I'm loosing my mind, and you might think I'm trying to avoid your question. But there's actually a point to all of this. What I'm trying to demonstrate with this is:
We do not believe and worship our creator simply out of respect because he created us, but also out of thankfullness for the method in which he did so, out of love for the blesings we recieve, our of fear for responsability over our acts we have been given, out of guilt for this perfect creation we do not do justice, out of joy that is granted in our hearths, etc. At first sight your hypotetical alien doesn't come close.