God is real, whether we like it or not. The self is an open system that cannot help but be influenced by external forces originating from the system that is bigger than the self. Thus, the self is a subset of the bigger system. In this sense, God’s existence is self-evident if you believe that cause-and-effect is real.
We don’t need the bible to tell us that. In fact, the bible itself tells us that “what can be known about God is plain to [us], because God has shown it to [us]”. The following verse refers to humankind in general, and not specifically to people who already have bibles. Obviously, the bible could not have existed “ever since the creation of the world”.
New Revised Standard Version (NRSV)
The Guilt of Humankind
18 For the wrath of God is revealed from heaven against all ungodliness and wickedness of those who by their wickedness suppress the truth. 19 For what can be known about God is plain to them, because God has shown it to them. 20 Ever since the creation of the world his eternal power and divine nature, invisible though they are, have been understood and seen through the things he has made. So they are without excuse; 21 for though they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their senseless minds were darkened. 22 Claiming to be wise, they became fools; 23 and they exchanged the glory of the immortal God for images resembling a mortal human being or birds or four-footed animals or reptiles.