When we consider who God is, a basic question we must grapple with is how God is revealed to us. Do we discover Him on our own?
On our own, we cannot know God at all. It is necessary for Him to reveal himself to us. Consider this from Paul in Romans 1:19.
For what can be known about God is plain to them, because God has shown it to them. 
The universe and creation reveal God as well. God chooses to be known this way, but it is God who reveals it.
Personally, we come to know God through our salvation experience.
Consider what Jesus says in Matthew 11:27:
All things have been handed over to me by my Father, and no one knows the Son except the Father, and no one knows the Father except the Son and anyone to whom the Son chooses to reveal him.
This kind of knowledge of God is not found through our own efforts or wisdom.
- For since, in the wisdom of God, the world did not know God through wisdom, it pleased God through the folly of what we preach to save those who believe (1 Co 1:21–22).
- The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned. (1 Co 2:14).
- And even if our gospel is veiled, it is veiled to those who are perishing. In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of the Messiah [Christ], who is the image of God. (2 Co 4:3–4)
- No one has ever seen God; the only God, who is at the Father’s side, he has made him known. (Jn 1:18)
It is necessary for God to reveal Himself. We are sinful and deceived. On our own, we will misinterpret who God is and His powerful ways. I interact with lots of atheists. This is clear.
Those who “by their unrighteousness suppress the truth” are those who “became futile in their thinking, and their foolish hearts were darkened.… They exchanged the truth about God for a lie” (Rom. 1:18, 21, 25).
It is clear we need the bible to help us. How can we interpret revelation correctly? The bible is our source. With the guidance of scripture, we continue our journey to miss God’s goal for our lives [sin]. We are dependent on the bible to communicate the true nature of God and how to love Him
 The Holy Bible: English Standard Version. (2016). (Ro 1:19). Wheaton, IL: Crossway Bibles.
 The Holy Bible: English Standard Version. (2016). (Mt 11:27). Wheaton, IL: Crossway Bibles.