Everything you know about God came from man.
You could not be more wrong, nor should you assume you know from where my witness of God and the Savior come from. I have a witness of the Spirit of the truth of God and his son Jesus Christ. A witness from the Spirit is such a powerful thing and leaves such an indelible impression that it cannot be of anything other than divine orgin. I invite you to seek for such yourself. You will know it when it comes.
How do you know?