Not true. Paul said you were wrong. I believe Paul
Rom 1:18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;
Rom 1:19 Because that which may be known of God is manifest in them; for God hath shewed it unto them.
Rom 1:20 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:
This verse is referring to the need for belief in order to know of anything's existence and occurrence, even the physical requires a believing mind in order to occur. So, if man knows that they can't know anything to exist or occur without a believing mind, then why do unbelievers think they should know God without believing He exists first?