In a conversation with most Anglican theistic evolutionists, or 'long age' creationists, you'll come to some sort of argument that the days of Genesis 1 do not mean days like we experience them, but something else. The 'something else' is, of course, indeterminate periods of time, or epochs, or some long period that correlates with modern 'geological time'.
I don't think they realise that in relying on this move to save their accommodation of naturalism they have left biblical theism and adopted a pagan approach where the truth is obscure, hidden, not amenable to any but the 'adepts'. Our world in paganism is shrouded in non-causal mystery and we are not free.
The Bible frames our world and relationship with God differently. It is open. We know who we are and who God is. It is revelation, not occult (hidden). The creation in Genesis is part of the great arc of revelation that ends in Christ and sets us free.
