It isn't just "creationists" who make these estimates. Physicists and cosmologists think that tiny changes in a number of fundamental physical constants (like the charge of the electron, etc.) would have resulted a universe in which life of any kind would be impossible.
Maybe so, but so what? If this is an apolegetics for god, it is a very weak one. IF the universe were different, there would be no life. IF evolution were different there might not be human life. Then no one would be here to argue about it, or to observe the Universe.
IF a different sperm united with a different ovum, each of us would be different.
IFs mean very little.
It isn't just "creationists" who make these estimates. Physicists and cosmologists think that tiny changes in a number of fundamental physical constants (like the charge of the electron, etc.) would have resulted a universe in which life of any kind would be impossible.
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Without entering into the question of Gods, what makes a physicist or cosmologist believe that he is capable of determining whether an alternate universe could support life?