Knowing God as father can only occur as Christ is revealed in you. You may know him as the omnipotent, omniscience, omnipresent God but knowing Him as father only happens through His Son, Luke 10:22, 22 All things are delivered to me of my Father: and no man knoweth who the Son is, but the Father; and who the Father is, but the Son, and he to whom the Son will reveal him. Many call Him father, but only the born again can call God father and see Him as His Son reveals the father to them . Revelation can only be made real by a birthing, as the believer see's the birthing, it will begin to open up new understanding to their position in Christ. Without the understanding of the birthing God will remain no different to them than the God of the Old Testament. Though He became their father the moment He birthed them, the reality of that fact will evade them. The answer to knowing God as father is "but by the revelation of Jesus Christ," Gal. 1:11-12, 11 But I certify you, brethren, that the gospel which was preached of me is not after man. 12 For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ. The Son revealed in the believer, will reveal the father. There is no other answer for the longing soul to be in oneness with their father. It is written in the scriptures how to know God as father. Just as we have many other ways to understand the things of God, this is the only way to understand God as father. Understanding God as father brings the believer into the realm of sonship. At this point the son begins to live his life in unity and oneness with his father. The "not knowing" is over and he now knows what was in his father's mind before the foundation of the world, John 16:20, 20 At that day ye shall know that I am in my Father, and ye in me, and I in you.