For instance: why would someone actually believe in Christ, but then balk at the infallibility and inerrancy of the scriptures? Jesus, the one whom they believe rose from the dead and then ascended to the height of all power, believed the Old Testament lock, stock and barrel. If one is basing their confidence in life and in life hereafter on the more than unlikely occurrence of this credulous guy rising from the dead, why so much as blink at inerrancy? To believe in the former while not believing the latter seems, minimally, inconsistent.
The same can be said concerning creation and evolution. Jesus believed in Adam and Eve and Noah's flood (and for that matter, Jonah's fish)--he cited their occurrences as factual back-up in his public disputations and teachings. How can one embrace the outrageousness of the gospel, but then hedge when it comes to instantaneous creation of kinds and Noah's flood (or any of the supernatural interventions of the Old Testament)? I truly cannot apprehend someone believing in Christ for salvation and simultaneously believing in evolution. It's a case of trying to have one's cake and eat it too.
What motivates those who believe in Christ but hesitate at believing in what Christ believed? Perhaps they bow down at the altar of their own intellects, all too willing to cede authority to human reasoning rather than Jesus' testimony. Maybe they would be embarrassed to believe such things and are unwilling to be thought a fool for Christ. It could be that they are merely ashamed of Christ before men. Regardless, what they need to remember is that Christ's resurrection is true or false with no shades of color in between, and if you're in it for a penny, you're in for a pound.
Come on, pick a side, make up your mind. It's not rocket science that gets anyone to eternal bliss in the hereafter with God, but Christ. You who believe in Christ, stop catering to the unbelieving and to your natural mind. The only good side that anyone needs to be on is the good side of Christ! He who is not with him is against him, so go "all in" for Jesus and stop hedging your bets. Never be ashamed of God's testimony.