The following is from a conversation I had with a Catholic friend I like and admire:
You made a passing comment about the lack of uniform belief in a literal week about 6,000 years ago through church history, and of course I cannot deny this. But then, no church had a doctrine of transubstantiation for the first thousand years of church history, and most today still do not.
One must build a case for what the Bible does and does not teach by the Bible, not by popular vote.
As AiG answers this better than I could, I shall just do a little cut and paste action here to explain why this is not an argument against my position, but rather, the history behind this question is a case against the OEC position.

From AiG:
Is Genesis non-committal on the age of the earth, as Sproul and many other scholars…