From their standpoint a theist is someone who believes in just one more being than they do and who therefore has the responsibility for justifying her or his belief in this extra entity. But from the standpoint of the theist this is already to have misconceived both God and theistic belief in God. To believe in God is not to believe that in addition to nature, about which atheists and theists can agree, there is something else, about which they disagree. It is rather that theists and atheists disagree about nature as well as about God. For theists believe that nature presents itself as radically incomplete, as requiring a ground beyond itself, if it is to be intelligible, and so their disagreement with atheists involves everything.
p. 47, A MacIntyre, – God, Philosophy and Universities