I am just back from Orlando, Florida, which is one of my favorite trips of the year as I participate in Student Leadership University. I did a series on worldview issues as well as answered questions for students, and one of the questions asked was “If you can’t see God, how can you really know that God exists?”
It is not uncommon for skeptics to suppose that we as Christians are irrational for believing in a God that we simply cannot see. In reality, it’s irrational for skeptics to presuppose that what cannot be seen doesn’t exist! The fact that something that cannot be seen does not presuppose that something doesn’t exist. We know black holes, electrons, the laws of logic, and the law of gravity all exist despite the fact we can’t see them! Indeed even a full blown empiricist holds fast to the law of gravity if he is standing on top of the Eiffel Tower.
Not only that, but as King David exudes, “The heavens declare the glory of God, the skies proclaim the work of his hands” (Psalm 19:1). Or in the words of the apostle Paul, “God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made so that men are without excuse” (Romans 1:20). If you want to put it another way, the order and complexity of the visible, physical, universe eloquently testify to the existence of an uncaused first cause.
One final point, God can be seen through the person and work of Jesus Christ. The apostle Paul explains that “in Christ all the fullness of Deity lives in bodily form” (Colossians 2:9). Indeed, it is the incarnation of Jesus Christ that is the supreme act of God’s self-revelation. Through the ministry of the Holy Spirit, we experience the power and the presence of God in a way that is more fundamentally real than even our perceptions of the physical world in which we dwell. Now we see but a poor reflection, just like in a mirror; but then one day in heaven we’re going to see face to face. Now we know in part, then we’ll know fully just as we too are fully known (1 Corinthians 13:12).