Sinned in a Literal Adam, Raised in a Literal Christ

I thought Keller in Reason for God conceded to some of evolution (maybe I should re-read it): Sinned in a Literal Adam, Raised in a Literal Christ – The Gospel Coalition Blog:

If you don’t believe Adam and Even were literal but realize the author of Genesis was probably trying to teach us that they were real people who sinned—Paul certainly was—then you have to face the implications for how you read Scripture. You may say, “Well, the biblical authors were ‘men of their time’ and were wrong about something they were trying to teach readers.” The obvious question is, “How will we know which parts of the Bible to trust and which not?”