What about Adam? And Eve?
Adam and Eve were selected from the choicest of God's children to be the Patriarch and Matriarch of the human family.
I mean your optimistic statistics could be a bit off if we consider that 3 out of the first 4 humans reported to have existed (Adam, Eve and Cain) all (presumably) had perfect knowledge of God and betrayed him - don't you think.
Neither Adam nor Eve ever betrayed God.
This idea that Adam and Eve did something wicked when they partook the fruit of the Tree of Knowledge of Good and Evil is very new, not agreed upon by the whole of Judeo-Christian religions and erroneous according to various books of scripture.
Adam and Eve partaking of the fruit had always been a crucial component of God's plan for His children because it caused them to enter into mortality, where their testing and eternal progression would continue.
We are all destined to become like God and spending time in mortality progresses us toward that goal by giving us experience with having a Knowledge of Good and Evil, just as God Himself said, "And the Lord God said, Behold,
the man is become as one of us, to know good and evil" (Genesis 3:22) (Bold, italics and underline added)
Cain, on the other hand, openly rejected the greater counsel from God, hearkened to the voice of Satan by forming a covenant with him, murdered his brother and lied to God.
On that basis, I reckon the "darkness" could get pretty cramped.
No. It is a false basis.
It would also appear that ignorance is by the far the best protection - wouldn't that suggest that most loving thing for Christians to do would be to immediately cease any preaching and teaching activities and try not to mention anything about God in casual conversation?
No, the exact opposite is true. It is by faith that we are saved. It is faith, not ignorance, that is our best protection.
No one is saved in ignorance.
In order for any creature to be saved from sin and death, they must come to know the Lord Jesus Christ and what He has done for them.
This knowledge can come to them in mortality or afterwards in the spirit world, but it must happen before they receive salvation.
It is
always better for the individual to come to this knowledge earlier rather than later, because it gives them more opportunities to exercise their faith and grow spiritually.
We all will die one day. It is the great equalizer. However, we all will leave this world at different levels of spiritual progression.
The knowledge of God and His Christ and experience we gain by using that knowledge will come with us to the next world and the more we possess the better off we will be.
We should be using this time to come to Christ, repent of our sins (which are slowing us down) and do good continually.