I think the "problem" or question here is essentially confused by words (or even techniques for solving problems) that push the answer one direction or another, if they come close to answering the question at all. The first part of the problem is a circularity or loop that cannot be avoided. The circularity relates in a way to the problem of defining words, and to the nature of reference to a limited circumstance: as humans we experience the world and universe in a certain way, and there is no way to escape that. This a problem that plagues dictionaries and mathematical systems. That is one problem.
The second issue is that when we as humans look at space-time we can easily visualize an empty space (or at least we think we can), and we have words (terms) that seem to work for that (Empty? Nothing?), but we (apparently) cannot, or easily, imagine a "timeless" space or the absence of time. We may think we have words for that, but we probably do not. Eternal and infinity may look promising as useful terms, but are they? Saying something or some condition is timeless means that something exists through time, not that it exists outside time, or there is no time. Avoiding that is not a simple issue. Using infinite or derivations of that word about time suggest something else, and there is no way to say that is helpful.
It is pointless to consider causation without the effect of time. Causation in any useful physical sense does not just suggest time, it requires time, and not just because of words like "it follows that..."
For that matter, the word causation, and its usual accepted meaning, may be part of the problem.
The early attempts to deal with this time issue in mathematics (Liebnitz and set theory) strike me as saying more about the theory used than about the problem itself. The theory does not come close to resolving the issue. More recent approaches to the problem suffer the same fate. The solutions suggest an image of trying to demolish a large modern concrete and steel structure the size of a mountain using only a pick and shovel, or scissors. The tools work fine for doing what they were meant to do, but the problem is beyond such tools. Even such a suggestion minimizes the nature of the problem.
What this may mean is only that there may be no "first cause" or any cause to the existence of space-time (our universe) as we can conceive of it now because without the matter that makes up space there was no time. And this obviously relates to whether our human idea of "time" has to be better defined and resolved. It does not mean we cannot continue researching and learning about the origins of the universe, and at some point the nature of the issue and problem itself may be more clearly revealed.