Their entire personal identity is wrapped up in this idea of being "Saved" by the blood sacrifice of Jesus. To believe that he died and rose from teh dead, they need to believe that the entire work is true. They need to believe in Original Sin in order for there to be a debt to be paid; they need Genesis to be completely true in order to believe in Original Sin.
I am a literalist as you know.
But I only need 3 verses in the Bible to satisfy my needs and I don't believe any lost person needs more than those same 3 verses.
3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
3:17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
3:18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
These three verses tell me:
God loved me. God gave His Son for me. That by believing I could have everlasting life and not perish.
The Son of God did not come to condemn the world but that it might be redemned.
Verse 18 tells me because I believe I am not condemned. It tells me before I believed I was condemned. It tells me the only reason a person is condemned is because they have not believed in the name of the only begotten Son of God.
These are the only verses in the Bible I considered when I turned my eternal destiny over to God.
Anything else is just icing on the cake.
"John 5:39 (KJS) Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me."