I wouldn't say, and have never said, that the Creation Account in
Genesis is irrelevant. What I have said is that I just don't think it is a deciding factor in whether or not one can or should believe in the Christian faith. I'm a rational Existentialist and my approach to engaging, assessing and accepting the contents of the Bible will be, needless to say, somewhat different than that of the typical Fundamentist Christian. But I'm ok with that ...
And where origins of the universe, of the earth and of life on earth are concerned, I am able to accept that science will say one thing and the Bible will tell me another, from different conservatories of insight, and I don't see how this paradox disrupts one's ability to think of Jesus as the Jewish Messiah who died and rose again. Basically because, directly, it doesn't.
So, the universe is, I think, a part of our existence that pertains to "deep time, " and it doesn't have to be a major problem for our theology. It's only a problem in conventional terms for those who don't give a damn about studying and thinking.
It's not all that epistemologically important to what a Christian "believes" where faith in Christ is concerned. Genesis merely provides a typological framework for the Sabbath structure of the Law of Moses. For those of us who are Christian in this day and age, all we are likely to do is think "Uh.... yeah, our Universe was brought about by God, and however it was done, we don't know!" End of story.