Well again, snakes did not evolve into birds, and birds did not evolve into snakes.<quoted text>
Allow me to articulate better. The genes of one species (the snake) can evolve into a different species (the bird). Or visa-versa. Then the genes of one species would have to be able to form a completely different DNA.
If there are so many commonalities in life why are there so many different species? Isn't it within reason to venture that all life came from one source?
Your children's DNA is not exactly like your own. There is a measurable difference in them. And the longer the chain of ancestors, the more variation of DNA. That variation tells us we are related, and yes we may very well have all come from one source. If you could only show your claim of a source, that would show evidence of a god. But of course evidence of a god is impossible if no god exists. Likely why no evidence of a god can be had.