Creationists argue that the universe has been finely tuned in order to support life. If the natural constants, the velocity of light, the gravitational constant and so on, were only slightly different then the physics and chemistry of the universe would be incapable of supporting life and hence of supporting intelligent conscious beings. The universe must therefore have been finely tumed by a creator to fulfill his intention of making life possible.
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It is certainly true that the natural constants are just as they should be but the argument would be credible only if this were the only universe.
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In my blog "The Uncreated Universe" I attempt to show logically that the concept of existence as a consequence of an act of creation entails a reductio ad absurdum so that the concept is meaningless. Things cannot be distinguished existentially, some existing and other's not. (The reductio ad absurdum may be perceived in that very sentence.)
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Therefore we cannot distinguish existentially between different universes. Among all universes there are all varieties of natural constant. There are therefore some universes that can support life of one sort or another and others that cannot. (The latter cannot be perceived from within to be universes.)
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Quite obviously, our universe is one of those that can support life. There may be others, maybe some with a physics and chemistry very different from ours.
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