What makes you think he's trying to present the scientific theory? That would be ... your role here.
And that is what I have done. I have presented evidence for the scientific theory. Here is a copy and paste of the post I made in the other thread.
First, we have the transitional hominids which have more basal ape features earlier in the temporal sequence and more modern human features later in the temporal sequence. Overall, we see a slow increase in cranium size, a reduction in jaw prognathus, a reduction in canine size, a reduction in lower jaw size, and a reduction in brow ridge size, to name a few. There are even more examples of transitional features in the post-axial skeleton, especially in the pelvis and wrists. We can go over those as well.
All of these transitions are consistent with evolutionary mechanisms and common ancestry.
On top of that, we have the genetic evidence demonstrating the evolutionary mechanisms at the molecular level. ERV's are viral insertions that insert randomly among many possible integration sites. Finding the same insertion at the same position in two individuals is proof that they share a common ancestor since independent insertions would produce insertions at different positions in the vast majority of cases. The random insertion of retroviruses is supported by oodles of observations in the lab, like in this paper.
Retroviral DNA integration: ASLV, HIV, and MLV sho... [PLoS Biol. 2004] - PubMed - NCBI
Not only that, but we have resurrected one type of retrovirus found in the human genome and found that it acts just like modern retroviruses.
Identification of an infectious progenitor for the multiple-copy HERV-K human endogenous retroelements
So we know that retroviruses in the past behave just like they do now. No assumption needed.
When we mapped the human genome, we found over 200,000 ERV's. That observation is found in this paper, in table 11.
Table[bless and do not curse]11 : Initial sequencing and analysis of the human genome : Nature
From the mapping of the chimp genome, we know that less than 100 of those human ERV's do not have an orthologous copy in the chimp genome.
Table[bless and do not curse]2 : Initial sequence of the chimpanzee genome and comparison with the human genome : Nature
So out of 200,000 ERV's found in the human genome, only 100 are not found at the same position in chimps. This is absolute smoking gun evidence for common ancestry between humans and chimps.
On top of that, we can determine that random mutations have shaped the human genome by looking at those same ERV's. From the Johnson and Coffin (1999) paper:
Third, sequence divergence between the LTRs at the ends of a given provirus provides an important and unique source of phylogenetic information. The LTRs are created during reverse transcription to regenerate cis-acting elements required for integration and transcription. Because of the mechanism of reverse transcription, the two LTRs must be identical at the time of integration, even if they differed in the precursor provirus (Fig. 1A). Over time, they will diverge in sequence because of substitutions, insertions, and deletions acquired during cellular DNA replication.
Constructing primate phylogenies from ancient retrovirus sequences
Is that what we see? Do we observe the divergence of LTR's as predicted by the theory of evolution through the accumulation of random mutations? Yep, sure do. Here are the phylogenies constructed by LTR divergence found in the paper cited above.
http://www.pnas.org/content/96/18/10254/F2.large.jpg
If you want evidence that natural seleciton has been in action, then look no further than the chimp genome paper found here:
Initial sequence of the chimpanzee genome and comparison with the human genome : Article : Nature
It details examples of areas of the genome that vary with respect to divergence rates as measured by Ka/Ks. This is experimental evidence of natural selection producing differences in the human genome.
If you won't even look at the evidence for common ancestry with our closest living cousins, then moving back further into human evolutionary history is a waste of time.