no

Absolutely not, and although no one can say for certain, it is highly improbable mathematically speaking.

I cannot even imagine a universe that required a creator.

At this point, I leave it up to the physicists to work out.

"Do you believe we could have a creator?"

Of course not.

"Could our entire observable existence be an intentional creation by something outside?"

I kind of doubt it because even if we were living in a computer simulation that would beg the question: how did the simulator get there then? It's always been there? - Then why can't the universe always have existed? - Because it just can't? - Then how can the simulator break that rule then? Whatever way you look at it you are forced to resort to 'Special Pleading' to maintain such a claim.

"To believe something I need some kind of evidence not just a strong likelihood. So to say I'm still agnostic on this idea."

Yes & that evidence need to be pretty strong too not just a 'Maybe..' or 'What if...'

"There is a thought experiment called the simulation argument that I find compelling to acknowledge the possibility of a creator of a sort."

Yes but it's not very compelling.

"The argument goes one of these three must be true.

We will not be able to create simulations of realities in the future.

We will all have a strong reason not to create simulations in the future.

We are far more likely to be in a simulation than not."

But on what grounds can a claim like 'We are far more likely to be in a simulation than not.' based? - It might be true because it seems plausible? Is that it? - How can we even know that a simulation would create any conscious minds capable of experiences like our own? Maybe they can but to assume they can is a HUGE assumption & that's assuming that such a super computer is even possible to build one day & we don't even know that. I read somewhere recently that even a super duper quantum computer could not generate a particular kind of random sequence of numbers (I forget the details) but in reality nature produces them all the while so we cannot be inside any sort of simulation. If I'm going to believe any extra ordinary claim I'm going to need a pretty extra ordinary reason to do so. I'd rather not kid myself I can know something when actually I have no good reason to do so. Often times 'I don't know' is the very best & most honest answer available to us.

Yes, but it's more likely I'll win the lottery even though I don't buy tickets.

That's voodoo science. My only creators are my mom and dad- there's no simulation. Simulations don't feel pain, joy, pleasure, and don't evaluate facts for themselves.

It could.
It also could have sprang into existence an hour ago, complete with our memories of last week. Both are possible, and neither is especially testable.
If it was created by an intelligent being, then that being either was created by another or appeared without a creator.
At some point, there must have been an intelligent being not created as the experiment of another intelligent species.
Since there must at some point be a spontaneous intelligence, I like to think our flawed species evolved without requiring a creator.

I'm here, I exist, I love my cat. Enough already, I may just need some human contact. I'm simple really and may just need real contact with a living person.

We exist because we're here. Simple. I'm an atheist and that's not going to change, I need a real person to talk to.

After looking at other comments most are nonsense. We are on our own, no help from a mythical being, nonsense. Accept that we're here on our own and go from there. We can do it. I just want to meet another person that doesn't need superstitious support from a non entity.

We mostly make our own realty. Mostly fluid at best. Need to talk to a simple straightforward person to get my bearings.

The only creator is our evolutionary past, nothing magic at all. We exist. We create part of our reality, besides that, the expanse is limitless.

One last point. I'm an atheist. I don't believe in any god(s) at all. It's nonsense. Sorry, I've looked for over 40 years and, no, no deities.

My only creators are my Mom and Dad.

We do have a creator: The Universe and the physical laws which govern it. Life is a predictable consequence of the interactions of the atoms, elements and molecules that comprise the stardust from which all life emanates given the right conditions. This may beg the question as to the creation of the Universe itself for which there are several theories but within the context of the closed system that is the Universe there is no mystery as to the creation of life anymore than there is a question as to the formation of stars, solar systems and galaxies.

No reason any of those need to be true.

Other than our parents?... No.

I don't understand the thought experiment, just because someone said one of those choices must be true, that doesn't make it so.

I'm an empirical evidence fan myself.

I see no reason to think that a creator is necessary or to believe that one exists.

Not only are gods created in the image of humans, but even the idea of a creator, a first cause is something out of our own human need for answering unanswered questions. It is a concept that has been invented by humans and nothing more. You (the collective you) made it up.