Difference?
See a difference?
I thought a scientific theory was based on a scientific method?
Yep. For example, here, we were testing Darwin's theory, which predicts that it should be impossible to formulate a universally-applicable definition of "species." As you might have noticed, that prediction is confirmed.
The scientific method tests theories, right? Over and over and over again.
Yep. Many, many predictions of evolutionary theory have been tested and confirmed.
When will the scientific method be through?
Never. Theories either gain increasing confirmation, or are refuted. Darwin's theory remains increasingly confirmed. Want to see some examples?
When will what it tests leave the realm of "thought to be correct" or "believed to be true"
Around 1940, when it Mendel's work was rediscovered, and it became apparent why new alleles can persist in populations. That pretty much settled it as far as science was concerned. But as more and more predictions (such as Huxley's prediction that birds evolved from dinosaurs) were confirmed, it became more certain.
and say it is "undeniably right and there is nothing more to worry about, we know all there is to it"?
That never happens. Science is based on increasing levels of confidence. Sort of like you believe there will be oxygen atoms in your room overnight. It's not that we know all there is to it. It's just that we have so much evidence to confirm it, that it's foolish to argue otherwise. That's how well-established theories like evolution go.
And until then you live by faith
In God, yes. Science requires evidence. Which is why Darwin won.