Rev. 12:9 says: "So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him."
Isaiah 6:9-10:
And He said, “Go, and tell this people:
‘ Keep on hearing, but do not understand;
Keep on seeing, but do not perceive.’
10 “ Make the heart of this people dull,
And their ears heavy,
And shut their eyes;
Lest they see with their eyes,
And hear with their ears,
And understand with their heart,
And return and be healed.”
‘ Keep on hearing, but do not understand;
Keep on seeing, but do not perceive.’
1 Corinthians 1:18:"For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God."
Romans 10:17 "17 So then faith comes by hearing, and hearing by the word of God."
In a nutshell the whole world is deceived by the father of lies who is Satan. Thus we become skeptics and unbelievers. If you start reading God's Word, the bible with an open heart to seek and find God then you will obtain faith and realize that the bible is true and that Jesus Christ died for your sins in order to reconcile you to God the Father and inherit eternal life.
Matthew 7:7-8
7 “Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you.
8 For everyone who asks receives, and he who seeks finds, and to him who knocks it will be opened.