The Bible passage that many Christians don't believe is Genesis 1. They treat it as a myth - that the actual events never really happened in the way the literal text says it happened. The problem is that is that Genesis 1 is absolutely essential to the gospel of Christ. If Genesis 1-3 are just myth, then there is no Christian marriage, Fall, sin, Ten Commandments, historical Jesus, virgin birth, death on the cross, resurrection, Second coming, final judgment, heaven or hell.
Furthermore, no moral responsibility, therefore anything goes, which means abortion, homosexuality, child rape and porn, adultery, fornication, theft, lying, murder are okay.
In summary, no literal Genesis 1-3, then no gospel, and no hope for anyone. So eat drink and be merry, do as we like, and we die and are no more. Even if people say they are Christian and that Jesus died on the cross, it means no more than just being better human beings. But what is the use of achieving anything if it all ends in death and there is nothing else?
Science knows that the universe is running down like a battery that is losing its charge. So, eventually, the who universe and our world will be just a cold, lifeless bunch of dead rocks and so all human achievement will be as nothing because there will be no one left to appreciate it.
That is all there is if Genesis 1-3 is merely a myth.