I'm sorry, but what is your point?
That a ring species should become incapable of breeding due to a physical separation has exactly WHAT to do with evloution? As for the gull example: it's still a bird, but it can't breed with a sparrow, even though they are both definitely birds. So, what is it that you expect that isolated gull "ring" species to now become? A bat? A hummingbird? It's not going to happen.
Please demonstrate how a single cell became an organized species of any kind, by a series of random coincidences from a primordial soup and somehow magically organized itself into, say, an antelope! Or, no, hey - a frog! LOL How utterly ridiculous.
Just as we would not doubt that a watch has a watchmaker and could not organize it's very intricate parts by itself to tell the time, so do all the creatures on earth, even more complex than the watch, have a Maker.