Well, that isn’t the way he works. He gives us signs of his existence in nature, he also came in person ( the history of his unfolding plan of salvation as found in the Scriptures, which are historical facts open to all), and he works miracles even today, he has given us the example of the Saints, he has given us the wisdom of men like Augustine and Aquinas. He expects us to reflect on all this or what works for us to come to a knowledge of his existence and what he expects as a response. In other words, he expects us to take the hints, he isn’t going to hit us over the head with anything, he wants us to be free to either accept him or reject him. It is a test you see. How worthy are we? If we are honest, we will see the signs and come to the correct conclusions. Far too many people today think we are in a kind of game. No it is not a game, eternity is in the balance.