The fool says in his heart, “There is no God.” They are corrupt, they do abominable deeds, there is none that does good. -Psalm 14:1

Let me give you the reasons why the unbeliever usually is an unbeliever. It is principally because he knows not God; and none of us like to trust a person we don’t know. He knows nothing of the Most High, has never communed with Him, nor even seen Him in His works; and, therefore, he cannot trust Him. The unbeliever will also say that he cannot trust God because he cannot see Him, as if everything that is real must, therefore, be the object of sight as if there were not forces in nature about which no doubts can be entertained that are far beyond the ken of sight. They will also say that they cannot trust God because they cannot understand Him. If we could understand God, He would not be God, for it is a part of the nature of God that He should be infinitely greater than any created mind… It is a most unreasonable reason not to believe in God because I cannot understand Him. The reason at the bottom is this-the ungodly man does not trust God, because he is God’s enemy. He knows there is a quarrel between the two. He has broken the law, he has become an enemy to his Maker; and how shall a man trust his enemy? Besides, he knows that God won’t do what he would like God to do. He would like God to give him good health to go on in sin; he would like Him to make him happy in his lusts; he would like Him to let him live a sinner and die a saint; he would like Him to shape the world so that man might take his sinful pleasure and live as he liked, and yet, after all, receive the wages of a righteous life; and as God won’t do that-won’t bring Himself down to the sinner’s taste-therefore, the sinner says, “I cannot trust God,” and then he turns round and laughs at the man who can, just to quiet his own conscience and keep the little sense there is within him from rebelling against him. ~ C.H.Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3512.cfm