If you were to ask me to argue for the existence of God without using a Bible, I would argue along these lines (see my other blog posts for an elaboration of these arguments).
I would argue from a position of conscience, this internal sense of right and wrong that we have written into us; this natural law of the heart that guides us in our moral decisions. And if there are moral laws there is a Moral Lawgiver.
I would argue from a position of design in nature. All that we see and experience in nature has structure built into it. It’s not a random cosmic carwreck that we see; it’s design and if there is design, there is an Intelligent Designer.
I would argue from a position of special revelation or Jesus Christ. Extra-biblical sources verify that Jesus existed during the time period and in the place that he supposedly existed found in the Bible. Furthermore, if he was the Son of God, then there is a First Cause – God the Father.
Finally, I would argue along the lines of the apologetic of human desire. Humans desire truth, beauty, honor, justice, courage, love, heroism. These longings go beyond just our senses. We can’t smell truth or touch love, yet we reach for them. We desire to be free, to discover our self-worth, to correct our immoral behavior, to piece the hurts of life into some larger picture of meaning (Mark Cosgrove). All of these desires are seen clearly in our mass production down through the ages of literature, art, music, worship, and movies, each of them featuring the innermost longings and deepest needs of human beings.
We reach out to worship something, even atheists do. How do you explain this longing for things beyond the natural, empirical realm, and our interest in blogging about them? Just like the presence of appetite presupposes the existence of food, the presence of worship and human longing presupposes that something or Someone exists who can satisfy these longings. And if there are these human desires, then we can conclude that there is a place or experience where they can be ultimately fulfilled – Heaven and a New Earth.
God exists and we don’t even need a Bible to know that this is true. But what the Bible does do for us is that it tells us His Name with specificity and invites us to know Him.