For His own reasons, he chose to give us a very high degree of confidence in the Resurrection and not nearly so much in Genesis. I don't pretend to understand his reasons.
But He wouldn't have made a universe the way he did, leaving clear clues all over about its immensity and ancientness, if he intended us not to use our reason to discriminate between parts of the Bible that must be accepted as true, as is, and parts that must be accepted as true metaphor.
It makes the job a lot harder. But it doesn't relieve us of the responsibility of applying our God given reason to do the best we can.
Jesus sure displayed a high degree of confidence about Genesis whenever He talked about it. Works for me.