Clave, that exact argument is why Christians don't like atheists all that much and many Muslims want to kill them. It has always been a matter of faith. I wouldn't respect any deity that made him or her self available for inspection that easily.
Every Atheist's favorite quote is "God is dead" from Frederick Nietzche. The forget about is the rest of what he said. He predicted, fairly accurately I'm sad to say, that the 20th century would be the most violent in human history and that the 21st would be worse. The void in the human spirit left by God's demise would be filled by the baser behaviors that Religions since time immemorial have sought to repress, whether it was through enlightenment or dogmatic principle. Man is an inherently violent creature. Religion developed to blunt the vast majority of that violence, because while the violent are highly unlikely to hearken to those they veiw as the weaker, they could hardly fight a surpreme, all powerful being.
I believe that God had a physical presence on Earth when he created Humanity because at that time everything was perfect and he could be in our presence. However, sin is anethema to Him, and after The Fall, sin was prevalent throughout the world and he could no longer allow Himself to have a physical presence on Earth. Thus sprang up religions to facilitate communication with Him.
