1. God is not visible
Those who reject to believe in God usually give two reasons: 1º God is not visible. 2º God is not understandable. They say: I only believe in something I can see. But I have not seen God. So God does not exist.
There are many things that exit or have existed and we do not see them. Have you seen Australia or New Delhi? I have not seen them but I am sure they exist because teachers and books of Geography say so.
A young atheist asked Chevreul, one of the most famous men in France and around the world: Do you believe in God? Have you seen him? And he replied: Of course, my boy, I have seen God, not in himself, because he is pure spirit, but in their works. Yes; I have seen his omnipotence in the greatness of the stars, in their fast movement and in the remarkable order governing the Universe.
MARY: I have not been in New York, but a friend of mine has been there and told me the things she bought. I have not seen that city, but I believe it exists.
JOHN: Electricity also exists and nobody has seen it really, but we know that it exists because of the consequences it produces: powers the light bulbs, operates the TV, the laptop and other electrical devices at home. We do not see electricity, but believe it exists.
MARY: When we see mountains, plants, animals and men, we should think that someone has made all of that, and that someone, wise and omnipotent, is God.
JOHN: You cannot see God with the eyes of the body, and cannot touch him either, because he has no body and is spirit, but we are sure that he exists because of his works.