So That We May Know God

Some very big questions:
Why is God’s plan the way it is?
Why is there evil in the world?
Why the fall of man?
Why did Christ have to suffer and die in order to redeem mankind?
Since God is all good and He did not prevent the fall it must have been better not to. But how could allowing something so seemingly devastating and in direct opposition to God be better?

"Known unto God are all his works from the beginning of the world." - Acts 15:18