The truth is that now all theories of origins, theistic or atheistic, involve speculation as to the nature of what it was that created a universe so fine-tuned for life. The question is only, was it an intelligent or an unintelligent cause that created time, space, matter and energy out of nothing? With regards to the argument from design, Columbia University astronomer, Robert Jastrow discussed what he calls “the most theistic result to ever come out of science”:
According to the picture of the evolution of the universe developed by the astronomer and his fellow scientists, the smallest change in any of the circumstances of the natural world, such as the relative strengths of the forces of nature, or the properties of the elementary particles, would have led to a universe in which there could be no life and no man…
It is possible to make the same argument about changes in the strengths of the electromagnetic force, the force of gravity, or any other constants of the material universe, and so come to the conclusion that in a slightly changed universe there could be no life, and no man. Thus, according to the physicist and the astronomer, it appears that the universe was constructed within very narrow limits, in such a way that man could dwell in it. This result is called the anthropic principle.
Some scientists suggest, in an effort to avoid a theistic or teleological implication in their findings, that there must be an infinite number of universes, representing all possible combinations of basic forces and conditions, and that our universe is one of an infinitely small fraction, in this great plenitude of universes, in which life exists.
As I’ve noted in previous works and posts, the design argument is quite modest by simply stating that intelligent causation can be detected in the natural world. The argument does not and cannot infer the identity of the designer alone. In order to identify the designer one must seek external evidences, such as other scientific, philosophical, historical, and theological evidences. A cumulative case argument would fulfill this need.
 Granville Sewell, In the Beginning (Seattle, WA: Discovery Institute Press, 2010), 25.
 Robert Jastrow quoted by Roy Varghese, The Intellectuals Speak About God, (Regenery Gateway), 1984.