What it is meant “The Knowledge of God?”

Not mere information about God, but a personal knowledge of God:

Genesis 3:8  

Then the man and his wife heard the sound of the LORD God as he was walking in the garden in the cool of the day, and they hid from the LORD God among the trees of the garden.

James 2:23

  

And the scripture was fulfilled that says, “Abraham believed God, and it was credited to him as righteousness,” and he was called God's friend.

Deuteronomy 34:10  

Since then, no prophet has risen in Israel like Moses, whom the LORD knew face to face,

Who in the Bible desires such knowledge?

Christ prayed “that they might know thee,”

John 17:3  

Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent.

Moses prayed, “That I might know thee,”

Exodus 33:13  

If you are pleased with me, teach me your ways so I may know you and continue to find favor with you. Remember that this nation is your people.”

God desires for man to know Him,

Hosea 6:6  

For I desire mercy, not sacrifice, and acknowledgment of God rather than burnt offerings.