Noticeable evolution happens over hundreds of thousands of years, and it is happening all around us with many other species right now. To help clarify your thoughts about Darwin's studies, a "bird" is not a species. A finch is a species of bird. And there are hundreds of them, while there are thousands more bird species.
Also, you cannot say humans will evolve because they changed their diet for few generations. Otherwise we would be an entirely different species than peoples who lived 3000-5000 years ago like the Egyptians and Greeks. They had very different diets than us yet we are all Homo Sapiens Sapiens.
And if the earth was created, how old do you think it is?
If evolution takes place over a course of hundreds of thousands of years, how did Darwin have the time to observe any type of evolution that’s measurable? What I was trying to say is - Evolution says we evolved from ocean life into what we are today. The finches didn’t evolve into something even remotely opposite of itself or species. It was still a bird and still noticeable as a finch. it didn’t change from a bird into a human, which if observed, would be solid proof of evolution. Evolution is not proven, nor is creation. We can’t observe the beginning of the universe, we can only theorize. My guess is that there’s something to the existence of life that’s more complex than we can comprehend with any type of technology at this point. Even from the vast space of nothing, if an explosion came known as the Big Bang, where did that come from? Evolution is a theory and Intelligent design is faith. I don’t mind what anyone chooses though. If everyone agreed with one another, then we’d never find a solution to anything. That’s the beauty of life :)