Common DNA is simple to explain if you consult an engineer. If you are going to build a vehicle you have a common blueprint and then add all the frills. The 98% of DNA common to apes and men account for all the physical differences found in both species; in other words each species DNA is what determines the animal.
By asking this question you have demonstrated your study of DNA is superficial.
All dogs have a common ancestor, the wolf. What you have is selective breeding and your dog has not evolved into a lion, horse, ape, man, or any other species. What started as a dog is still a dog and is microevolution.
The Talmud is the foundation of the Bible just as Darwin is the foundation of modern evolutionary theory so your simile only establishes my terminology.
We can see evolution within species (microevolution) but we do not find any evolution that fits Darwin's theory of all life evolving from a single cell.
The Cambrian explosion should be sufficient proof to show that Darwin and macroevolution are nothing more than a disproven theory. What Darwin said should not happen did happen and that is the sudden appearance of fully developed species. Darwin was aware of this before he published his book but believed that transitional fossils would be found that vindicated his theory. If Darwinian evolution were a valid thesis then you would expect to find some transitional fossils in the pre-Cambrian layers.