<human>:  Who was the first philosopher to argue that God is a logical impossibility?
<bot>: The first philosopher to argue that God is a logical impossibility was Bertrand Russell. He argued that if God exists, then God would be a logical contradiction. In other words, if God exists, then God would be both omnipotent and not omnipotent, both omniscient and not omniscient, both omnibenevolent and not omnibenevolent, etc.