Of course we can. We can because God has left traces of Himself in everything that exists: the splendour and beauty of nature, the amazing complexity of biological phenomena, the sense of what is right that we all carry inside, the nostalgia of perfection that lays in the deepness of our heart; man is naturally able to discover those traces and, following them, he can reach God.
It is amazing to think that we increasingly use our capacities to make ourselves owners of nature and to achieve surprising technological advances, but we don’t use those capacities to reach God. How comes that human intelligence is able to achieve so many technical and scientific progress and does not have the ability to solve the enigma surrounding its life? What happens to the human being, that is a mystery to himself? How can a person go through life without asking about the issue of his or her origin and end and about the meaning of his or her life? Those who hide those issues deep inside and renounce to understand themselves are self-condemned to live a life less human, less authentic, and more absurd. Those who want to answer those questions must formulate the question about God: does God exist?