They have been saying this since the time of David.
The fool says in his heart, God does not exist.
They are corrupt; they do vile deeds.
There is no one who does good.
Silly scientist, how can you think you can learn everything when with every new discovery, you learn about even more things that you don’t know and never thought of before.
The Vedic religion allowed for some interpretations that there was no deity.
Essentially it states that karma defines everything -- and since there is karma, there is no need for a God as a governor. Furthermore it states that if God is an enforcer, God would be either egoistic or altruistic. Now, God's motives cannot be assumed to be altruistic because an altruistic God would not create a world so full of suffering. If his motives are assumed to be egoistic, then God must be thought to have desire, as agency or authority cannot be established in the absence of desire. However, assuming that God has desire would contradict God's eternal freedom which necessitates no compulsion in actions.