You two are going to have to define abstract thought and how it fits into reality. There is abstract thought and human concepts. This is not necessarily reality, just like we have math and concepts which assume tell us the point of the big bang. But there has been no concrete observations as to what happened 10k years ago, much less if there was existence more than a million years ago. That is a concept based on observations and confirmed hypothesis. It does seem to take a certain amount of time for something to happen, and we see it happening so therefore in a circular sense it has always happened, unless of course it did not, which we cannot varify.
By extension if there was not a starting point, then by circular thought, there is no end or beginning. That is the framework of the physical, material, observable known. However, God is not the point of filling in the "blank" unknown. That is a human idea based on the point that human's can have ideas. The only reason is because there is no room for a separate reality beyond the reality that we do know. The reality is that a finite thinking person understands only a finite existense, where the majority of knowledge is still unknown. While being able to conceptualize the infinite, and perhaps a personal grudge on not being privy to such infinity, that is, with no ability to make any sense or logical connection to such, is the issue.