To Know God...

Proverbs 2:1-5 (NIV)   My son, if you accept my words and store up my commands within you,  turning your ear to wisdom and applying your heart to understanding,
  and if you call out for insight and cry aloud for understanding,...
 then you will understand the fear of the LORD and find the knowledge of God.
Do you see what God is trying to show us?
Believe His Word
Memorized it( we often fail at this)
Apply it
Pray with serious intent
Seek His diligently and then you will understand and find the knowledge of God.
Why do we often fail in our knowledge of God?  We do not do the things that require us to know Him. Basically, and admit it, we are lazy when it comes to spiritual things.