At best...
At best, it gives us a skilful external contriver working on a pre-existing dead and intractable material the elements of which are, by their own nature, incapable of orderly structures and combinations.
The argument gives us a contriver only and not a creator; and even if we suppose him to be also the creator of his material, it does no credit to his wisdom to create his own difficulties by first creating intractable material, and then overcoming its resistance by the application of methods alien to its original nature.
The designer regarded as external to his material must always remain limited by his material, and hence a finite designer whose limited resources compel him to overcome his difficulties after the fashion of a human mechanician. The truth is that the analogy on which the argument proceeds is of no value at all. There is really no analogy between the work of the human artificer and the phenomena of Nature.
The human artificer cannot work out his plan except by selecting and isolating his materials from their natural relations and situations. Nature, however, constitutes a system of wholly interdependent members; her processes present no analogy to the architect’s work which, depending on a progressive isolation and integration of its material, can offer no resemblance to the evolution of organic wholes in Nature.
The ontological argument which has been presented in various forms by various thinkers has always appealed most to the speculative mind. The Cartesian form of the argument runs thus: ‘To say that an attribute is contained in the nature or in the concept of a thing is the same as to say that the attribute is true of this thing and that it may be affirmed to be in it. But necessary existence is contained in the nature or the concept of God.
Hence it may be with truth affirmed that necessary existence is in God, or that God exists.’1 Descartes supplements this argument by another. We have the idea of a perfect being in our mind. What is the source of the idea? It cannot come from Nature, for Nature exhibits nothing but change. It cannot create the idea of a perfect being. Therefore corresponding to the idea in our mind there must be an objective counterpart which is the cause of the idea of a perfect being in our mind.
This argument is somewhat of the nature of the cosmological argument which I have already criticized.