He (God) did not leave himself without witness, in that he did good, gave us rain from heaven and fruitful seasons
Acts 14, 17.
No human being can see God. Does that mean that He does not exist? That would be a foolish conclusion. Even if we cannot see Him, He has revealed His existence in manifold ways.
Through the creation. We recognize the Master by his work. What may be known of God is manifest … “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” (Romans 1, 19.20).
Through our conscience and personal experience. God gave man his conscience as the indicator of good and evil (cf Romans 2, 15). In the circumstances of our life He reveals His goodness (cf Matthew 5, 45; Acts 17, 25).
Through the fulfilment of prophecy. God, who alone knows what the future holds, has given us many prophecies in the Bible. “Remember … I am God, and there is none like me, declaring the end from the beginning” (Isaiah 46, 9.10).
Through Jesus Christ, His Son. In Him God revealed Himself fully. “No-one has seen God at any time. The only begotten Son, who is in the bosom of the Father, he has declared him” (John 1, 18).
God has indeed revealed Himself. Anyone who wishes can get to know Him and experience His nearness.