An eternal universe is the very epitome of the problem of infinite regression. It leads to the equally valid assertion of an eternal creator deity.
ETA: I should clarify that. What I mean is that if you are going to assert an eternal universe, which is all you can do since there is no direct evidence for it, then you have to allow others to assert an eternal creator. Both are equally valid as unproven assertions.
Both are not equally valid since there is no doubt about the existence of universe, while there is no evidence about the existence of a God. The universe exists, and hence there IS a possibility that it might be eternal. The same cannot be said about God.
Do we all agree that we are talking about a creator God here?