What is the effect of ignoring or choosing not to believe a section of Scripture?

Ken Ham explains in this video that the effect of ignoring and refusing to believe even a few chapters of Scripture can have catastrophic consequences. Saying that even one portion of Scripture is inapplicable to us or untrue undermines the validity of every other chapter in the Bible.

Today, many churches have largely ignored or chosen not to believe the first eleven chapters of Genesis. Yet, they claim that the rest of Scripture is somehow valid and true, just not these chapters. It is not possible to claim on one hand that all of Scripture is true and sufficient when you are willing to ignore a section of it. Either it is all true or it isn't. 

Psalms 119:160 (NKJV) - "The entirety of Your word is truth, and every one of Your righteous judgments endures forever."

We need a new reformation and I suggest we start nailing Genesis 1 to 11 on the doors of churches and Christian colleges and Bible colleges and seminaries across this nation. Now you may get arrested for vandalism or something but in a way symbolically we need to be nailing Genesis 1 to 11 on the doors of churches because what I'm saying is that's where we lost it in this era history. The Genesis 3 attack today has been specifically focused on the first 11 chapters of the Bible. Much of the church has succumbed to that attack. And if we're gonna see a reformation in our churches, it's gotta be a return to God's word and to deal with that genesis re-attack that's occurring in today's world.