However, I have problems with the idea that sheer random chance led to the creation of the original amino acid compounds here on Earth. Any arguments in support of the idea that life may have been "seeded" here fail to address where the sower originated from.
I am personally of the opinion that the real answer has yet to be offered. I'm currently leaning toward the idea that their is either some form of "template" superimposed upon our universe that forces everything, from atomic structures to complex molecules to galactic clusters, to comform to a certain limited number of possible arrangements. Stephen Wolfram is addressing this concept in his new book "A new kind of Science". You can find out more at his website here or at www.stephenwolfram.com if the link doesn't work for you.
If this theory is correct, then the existence of life would be because of the fact that the "patterns" of life, from the most basic molecular combinations to form the first amino acids, to the bilaterally symmetrical forms taken by most living things, are literally "embedded" in reality, and that all of the possible forms of life that can exist probably do exist in whatever niches that can support these forms of life.
However, the incredible number of mutations it takes to go from bacteria to human being is incredible. You can't chalk it up to a "change in frequency of certain genes"... somewhere along the line, mutations have to occur. For example, you won't find the genes for wings or elephant trunks anywhere in the human genome pool.
So, yes, randomity plays a huge role in evolution...
Wake up, you silly people! There is truth in the Bible, but none of it is true. Don't accept the easy answer; the universe is a complex and wondrous place. Science is the only way to understand it. The Bible was written as a behavior modification and control tool, to keep the masses compliant, obediant, and unquestioning. Clearly, as judged by your postings, it is still working.