Postmodernism denies that we can know the truth which leaves people to accept for themselves as valid what ever wild thought pops into their head. Such a perspective is attractive because it enables people to be accountable only to themselves and denies an Almighty Creator who will judge us. This perspective is what gets the nations in hot water with God during the Tribulation...
Why do the nations rage, and the people plot a vain thing? The kings of the earth set themselves, and the rulers take counsel together, against the LORD and against His Anointed, saying, "Let us break Their bonds in pieces and cast away Their cords from us." He who sits in the heavens shall laugh; the LORD shall hold them in derision. (Psalm 2:1-4, NKJ)
I am convinced that people who doubt we can know the truth about God really don't want to know the truth about Him. They are happy going along as they are with whatever belief system they have manufactured for themselves since it just feels right. They have made God in their own image. This is plain and simple rebellion against God. And the consequences for holding to this philosophy is to get what they desire... separation from their Creator for eternity. "There is a way that seems right to a man, but its end is the way of death" (Proverbs 14:12).
God has made the truth easily accessible to anyone who really wants to know it. The Bible is the most published book in the world by a huge margin. The Bible has been translated into more languages than any book in history. There is a reason the Bible has been so successful... the Almighty Creator wants us to know him. The first thing governmental authorities who hate God do when they come to power is make the Bible illegal; yet it is amazing how the Bible has overcome all opposition to be everywhere. There is a reason for this, God is behind it.
A common way of dismissing the Bible by skeptics who don't want to let go of their personal view of God is to say that the Bible is subject to interpretation... "who can know what it really says?" This is just more postmodern philosophy that corrupts a person's ability to think clearly. God gave us His Word so that we may know Him. Thus God would have to make the Bible understandable by the common person without needing some specially anointed intermediary to tell us what God is really saying to us.
The problem is that people just don't want to believe what God has said to us in His Word. They may accept this piece or that piece but reject the truths they don't like. Such lukewarm acknowledgement of God is worse than being a blaspheming atheist... Jesus said, "because you are lukewarm, and neither cold nor hot, I will vomit you out of My mouth" (Revelation 3:16).
My own personal discovery that I can take God's Word literally was the most liberating development I have ever experienced next to being born again. The Bible is full of prophecies that have been literally fulfilled; thus we should expect the ones yet to be fulfilled to be fulfilled literally as well. This is simple logic that anyone who honestly seeks the truth must acknowledge.
God wants us to check these things out for ourselves. "Oh, taste and see that the LORD is good; blessed is the man who trusts in Him!" (Psalm 34:8).