When Job had been thoroughly rebuked by God, he admitted he had spoken in both haste and ignorance. He'd heard of God, but now he had actually seen Him. Or had he? This is one of the greatest difficulties in understanding Christianity. Did Job really see God? If he did, how could Jesus claim to have been the only one to have seen God? (John 1:18).
This is where we need to take into account how Job could claim to have seen God. See, he hadn't actually seen God. At best, he had seen a talking whirlwind (Job 38:1). Is God a whirlwind? No, no more than He is a burning bush. These were simply worldly things through which God chose to present His voice. In context, Job had just been told about, and even shown a number of God's creations. He was questioned about astronomy, about geography, about zoology, Job could not answer God even once. But God could certainly answer Job, showing off the world He created, and His sovereign power over it.
And so Job said "I had heard of you, but now I've seen you". In the New Testament, we see a similar claim. Romans 1:20 tells us "His invisible attributes are clearly seen, being understood by the things that are made". The world around us tells us everything we need to know about God, at least so far as giving us no excuse to deny Him. His infinite power, His masterful intelligence, we can even figure out the fact that we can never truly know God, because even His significantly less impressive creation is just too vast for the human mind to comprehend. Thus, if you have seen the creation, you, too, can be said to have seen God.
Sir William Bragg said it best: "Sometimes people ask if religion and science are not opposed to one another. They are: in the sense that the thumb and fingers of my hands are opposed to one another. It is an opposition by means of which anything can be grasped." Go out there, study the creation, you will understand God in brand new ways.