It has been said, and generally accepted, that the existence of God cannot be proven. I disagree.
It is true that the existence of God cannot be scientifically proven. Since scientific proof requires observation, nothing unobserved can be scientifically proven. Of course, this means that no historical event predating photography can be reliably proven.
Yet we confidently teach thousands of years of history. For this we rely on historical proof, based upon a preponderance of evidence. Incidentally, no historical figure has stronger historical documentation than Jesus, and no historical book even comes close to the reliability of the Bible. But there is an even better proof.
A simple rational proof considers observation, evidence, and clear rules of logic to reach a conclusion through reason. This is the kind of proof lawyers rely on. Ironically, Christians are accused of abandoning reason for blind faith when the existence of a Creator God is the most reasonable conclusion, requiring the least faith. Here we go.
When you see chairs lined up in a row, you conclude someone put them in order. A skyscraper implies both a designer and builder. A painting must have an artist behind it. It would be unreasonable to think these things happen randomly.
Order, design, structure and beauty are proof of an orderer, designer, builder, creator. Even science teaches us that in the absence of intelligent direction, entropy rules. Consider that we have yet to design anything that approaches the order and complexity found in nature. The world screams “intelligent creator”. The proof is everywhere.
(Rom 1:19-20) "...because what may be known of God is manifest in them, for God has shown it to them. For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse..."
Don't be without an excuse. KNOW what you believe.