Here's a clue:
When you assume everything is from man, you limit yourself severely in scope and intelligence. Ironic isn't it?
Romans 1:16-23 (KJV)
16 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth ; to the Jew first, and also to the Greek. 17 For therein is the righteousness of God revealed from faith to faith: as it is written , The just shall live by faith. 18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness; 19 Because that which may be known of God is manifest in them; for God hath shewed it unto them. 20 For the invisible things of him from the creation of the world are clearly seen , being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: 21 Because that, when they knew God, they glorified him not as God, neither were thankful ; but became vain in their imaginations, and their foolish heart was darkened . 22 Professing themselves to be wise, they became fools , 23 And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things
