An objectivist is an atheist. He doesn’t hold any irrational values, since reason is his primary, defining value, and the means of his survival in existence. He is an atheist because he understands that to believe in God is irrational.
Now, most people define God as someone who created the Universe. Careful examination of this statement will show its own self contradictory nature. Because, by definition, Universe is everything that exists. And Something/anything is always a part or subset of everything. Hence, the idea of that which is a part of everything has created everything is self contradictory.
Now, an even irrational believer in God could argue that God doesn’t have any definition. But this is a still more obvious self contradictory statement. Because when you are saying that something doesn’t have a definition, you are confessing that it doesn’t have an identity or existence. Because anything that exists has an identity of its own, and it must be definable. A is A. That is the meaning and purpose of definition: A statement that specifically points out anything in existence, if it truly does exist. So, by confessing that God doesn’t have a definition a theist is accepting that God doesn’t have existence.
Now another theist rises up and claims, God is true because I and millions of others like me want to believe it to be true. This final statement is a theist’s confession of his own insanity. The truth or falseness of a claim has nothing to do with the number of people who believe that claim. It depends on objective validity of that claim. Just because you want to believe that a woman who has been raped hasn’t been raped, it doesn’t make it so. Just because you want to believe that you can fly like a bird when you jump off a cliff, doesn’t make it so. If you act on the premise that believing in something makes it true, you’ll destroy yourself, and possibly many others around you.
Millions of people have been killed all over the world just for being sane and understanding that God doesn’t exist. And what is still more sad is the bloody conflict among different groups of people that fight over the superiority of their own particular non existing GOD.
Core of any conflict of interests is Irrationality. There are no conflicts of interests among rational men. Rational men do not resort to violence and kill each other. They reason with each other. No rational man in history had ever been able to massacre millions of men. It had always been made possible by manipulating the gullibility of the people to believe in some non-existent by an irrational man, guided by Philosophers of non-reason. You want objective proof? Massacre of Jews in Germany by Hitler, guided by philosophy of Will to Power by Nietzsche. Massacre of millions all over the world by leaders of commune, guided by philosophy of Communism, framed by philosophers acting on the premise of death. Still more reason to point out the objective necessity of a rational philosophy for man: Objectivism.