As someone who is, for lack of a better term, religious, and who also believe that the universe is fundamentally calculable, even if I accept the proposition that we are likely simulated, I don’t think it’s an argument for religion. At best, it’s an argument for Deism. Now, following that, one could make an argument that Deism is religion, but one could also make a similar argument that really Atheism is equivalent to Pantheism. Those would be, from a certain perspective, logically sound arguments, but in so doing, those arguments lose an intangible aspect that is essential to what makes them what they are.
Ultimately, though, I’m not even sure that this makes a meaningful Deism argument either. To me, it’s sort of like making an argument that aliens seeded life on Earth, or even manipulated it along the way, and so that invalidates current ideas about evolution and abiogenesis. But all it really does is push back the starting point, because we cannot create an infinite cycle of aliens created by other aliens. Similarly, even if our universe is simulated, we eventually have to work up to some reality where they are not simulated.
Worse, if we accept simulation as a possibility, we’re left with more questions than answers. Can we ever meaningfully determine if we’re actually simulated or will it always remain conjecture about why certain aspects of reality are the way they are? I’m strongly inclined to think we cannot. If we assume we can meaningfully determine we’re simulated, can we ever possibly learn anything about the nature of the universe of our simulators? I think this is even more far fetched, but if we can, how far up can we trace it? Even if we can determine all of that, what does that really gain us?
If we find out we’re just some simulation running on some super computer in some unimaginably different alien universe that’s just the result of some random pre-conditions and a few rules, how is that meaningful different from just the universe being the way it is for no particular reason. I say this, because ultimately, regardless of whether the assertions of one’s religion are true or not, the motivation behind religion is one for purpose. Theism, in essence, asserts that there is some purpose, or at least reason, for us existing, and that purpose or reason is inherent to our beliefs or understanding about the nature of the creator. Atheism, in essence, asserts that there is no underlying purpose or reason. So if we’re simulated, considering that we’re such an insignificant part of the simulation so as to be likely nothing more than an anomaly, and considering the implications of the assertion that we’re probably not even if the first layer, any claim to purpose or reason becomes negligible. So, ultimately, we’re left with a much more complicated explanation for the same fundamental world view.