Without young earth creationism the Christian story has major problems
the biblical story of genesis can't match with evolution or old earth people combining them are deluding themselves if death existed before the fall of adam then fall of adam didn't bring death to creation death was the process by which adam was created and jesus who is called the second or last adam has no reason to come and defeat death
theistic evolution which is the story of 100s of millions of years of suffering and death of billions of sentient creatures can't be the method god calls good when he created humans in genesis 1 it's monstrous it will make god the author of unbelievable amount of suffering