Good start.
And this is evidence that humans evolved from a fish?
Yes, it is. It's not the whole evidence, but it's absolutely a component.
That seems a bit like saying "Without some mechanism there's no reason to doubt that a human will one day run as fast as a cheetah."
Good thing we have mechanisms for that then.
Divergence within a species is one thing - a human evolving from a fish is quite another.
How so? We've established that species can vary to the point of splitting into separate, but similar species... and we have evidence of ever further variation.
A lion and a tiger are separate species of great cat, closely related, but no longer the same species... but a puma or a cheetah are also clearly cats but futher away and less compatible.
No one is disputing that genetic evidence confirms microevolution (variations within a species).
The same genetic evidence for paternity and micro evolution within species demonstrates degrees of genetic reateedness between more distantly related life forms.
Fossil evidence reveals changes over time ("evolution"), but fossil evidence tells us nothing about what happened between Fossil A and Fossil B, nor anything about what biological process was responsible for their respective appearances.
Except the fossil evidence is consistent with the genetic evidence.
And new mechanisms are not necessary to explain the evidence. Micro evolution leading to divided species can also explain over the built up changes over a longer period of time.
Furthermore, the fossil is characterized by the sudden appearance of species and stasis of species - so much so that Gould described Darwin's theory of gradualism as an "embarrassment" ... which is rather ironic, bcoz Gould's bizarre theory of Punctuated Equilibrium is even harder to swallow. The bottom line is, evolutionists struggle to explain the fossil record.
Not true.
I think you should try reading what "evolutionists" actually say in context, rather than dishonest misrepresentations of their points.
Punctuated Equilibrium is an explanation about how the rate of evolution can vary depending on environment not a universal explanation of the process of evolution.
In many instances the evidence indicates more gradual changes and adaptations.
Rapid changes in environments lead to higher evolutionary pressures and greater speeds of fixing of new or rare traits.
A nested hierarchy is understandable. The appearance of novel organs and body plans and the sudden appearance of new phyla ... not so much.
Do you have a specific example? If you examine most new novel traits in life forms it's pretty clear that it's actually a new adaption of an existing organ or structure.
If you look at the skeleton of a seal's flipper you can see that it has enclosed toes foot structures much like related land carnivores.