The fact that most people don’t understand God is not because God is complicated. God is not complicated; most people just don’t understand Him. But that too is not due to God. God wants to give each person understanding:

“If any of you lacks wisdom, you should ask God, who gives generously to all without finding fault, and it will be given to you.” (James 1:5; NIV)

The devil always makes everything complicated and confusing. Everything is very simple and clear with God.

But the book of Revelation is complicated.
No, not at all. The book of Revelation in two words: We win

Step out of the demonic-fueled darkness and confusion, and step into the liberating light and a living relationship with God where you can talk to Him about anything and He is your Friend who gladly listens and helps.

James 1:5 (NIV)