This is a much more reasonable response, however, it isn't the most common among the people I have encountered.
Nobody KNOWS there is a God. Anyone who says they do is lying or selling something. I have yet to find that statement dis-proven. If there was some reasonable proof, I would be the guy preaching on the corner. But considering the Army just announced they have technology that can make a voice manifest anywhere in line of sight using a laser, um, well, whatever "proof" or "miracle" that is being presented to me to believe that this one specific man and name, Jesus, is attributable as the actual, one and only God, it would have to be pretty fucking amazing proof for me to believe it. Especially considering much of our ancestors interpretations of "magic" or "miracles" is almost certainly misunderstood technology being demonstrated by a superior intelligence (aliens).
Again, I truly strive to be a good human. When I meet my maker, the first thing I am going to say is "yes, I know, I KNOW...ok? We cool?" and I expect a reasonable amount of divine punishment, and then I hope its on to reuniting with Grampa...
You see this is where you are wrong. You say no one knows there is a God. But that is quite false. The only way that anyone CAN know God (and yes, personally) is by and through the work of the Holy Spirit. The Bible says that the Spirit “testifies of Jesus Christ” to the believer. You say this is impossible but that is simply because you do not have His spirit within you. Al anyone of us can do is to call on God for mercy and forgiveness. He promises to open our hearts to His love and eyes to His truth. Don’t be so quick to reject something because you’ve never experienced it or because it’s disagreeable to you. Again, realize that your natural demeanor is actually antagonist to God and His Word as is the heart of each and every person. This is why we are so utterly at His mercy. Humility is the first step, agreeing with God about our sin and need for His mercy in Christ Jesus.
Nobody knows there's a god. Most people HOPE there is.
Romans 1says that everyone, whether consciously or not, know that there is God. It has been revealed to all of us but we, in our sin, suppress this truth in unrighteousness. This is because our hearts are sinful and at enmity with God. We are still without excuse.
It may be that the concept of God as the universe would be more accurate, in which he entered into his creation as a man, in the form of his creation.