Felix brings up an interesting point in that the words of Scripture were not meant to be difficult to understand nor are impossible to understand - as the Holy Spirit gives such an understanding to those who seek it. The hitch is we do not always listen and we often 'doctrinize' things with our intellect and in the process make things more complicated. Also not all the words out of our mouth are the Holy Spirit's words - and we can misrepresent the Truth that He testifies to us because sometimes we are not yet at a level to digest the full truth of a matter - which can lead to misapprehension (or partial apprehension) of a truth.
There is one reason why I believe the truth is hidden in plain site and one reason why revelation comes in a graduating scale.
The Word is Holy and is the nature of God, man is the exact opposite therefore it is literally a different language, Jesus confirms this fact quite solidly here:
John 8
3
Why is my language not clear to you? Because you are unable to hear what I say. 44
You belong to your father, the devil, and you want to carry out your father’s desires. He was a murderer from the beginning, not holding to the truth, for there is no truth in him.
When he lies, he speaks his native language, for he is a liar and the father of lies. 45 Yet because I tell the truth, you do not believe me! 46 Can any of you prove me guilty of sin? If I am telling the truth, why don’t you believe me? 47 Whoever belongs to God hears what God says. The reason you do not hear is that you do not belong to God.”
As we are born fallen then regenerated through being spiritually born again everyone must relearn everything he knows, this includes knowledge habits behavior etc..
Everyone learns at a different pace just as they would in the natural setting of education.
God reveals to us at a pace we can handle, I know from experience that it can be quite a mind blowing experience that can push a man to the very edge of sanity when the truth is revealed. Some find it impossible to accept!
I am still left to wonder in fearful awe when I am given revelation of the Holiness of God after nearly ten years.
But in terms of religion, disagreements and denominational disputes.
The danger of organized religion is that anyone can learn to recite and apply creeds and doctrines without actually knowing God at all. It's as I've heard some will say in catholic seminaries;
"there's good money in the God gig"