Only twice is it recorded that Christ marvelled at something: once at faith, and once here at unbelief. He didn’t marvel in the same sense that we do – in total surprise.
Unbelief is deliberate sin. It is contrived, a calculated insult. We choose to insult God because we do not want our lives to change. People say, ‘I can’t help my unbelief’, or, ‘I can’t believe as you do.’ They say, ‘No one told me’, or, ‘I did not have the information you have.’ But the questions are staring us in the face: Is there a God? Can we know God? Why are we here? Can God intervene? Where are the dead? Is there an afterlife? Many never seriously ask these questions. God sees you go to internet or library and research some question, or pursue some interest, but he sees you carefully avoiding asking about the big issues in life. Isn’t that the sin of unbelief? Don’t say, ‘I didn’t know.’ God will say, ‘I made you a curious person. You asked lots of other questions.’
Our belief is unreasonable, irrational – the mere fact that we are here. You can pin your faith on evolution in spite of its unanswered questions and its unworkable mechanism. You would rather believe that chance created all that you see, than believe in God who designed and made all life in this designed world. Look at yourself. There is no other explanation for your existence which you can really understand than that you are made in the image of God. The Bible alone says why we are what we are. We all have a conscience, but we are morally weak. It is the explanation given in the Bible that we were made in the image of God with a finely tuned sense of right and wrong, and we disobeyed God and sin came and took up residence in us. Now we are under the sentence of death, and God has introduced the principle of corruption into our world.
We are in a particularly bad cycle of unbelief in our country at the moment. Hardly anyone believes. Experts on TV don’t believe in God, nor in right and wrong. There is no adequate definition of what is sinful available to society. There is so much unbelief on display that we think it is amazing, extraordinary, unusual to believe.
Suppose a new government came in that could solve all major problems: in six months they achieved zero inflation, zero unemployment, and minimal taxes, and then the people just threw them out. It would be so irrational. It is similarly crazy rejecting God.