I wouldn’t “believe” in evolution as a static theory. We shouldn’t pretend to know how any of it works at this point. Our job is to continue gathering evidence and let that do the talking.
There’s pretty convincing evidence that birds (let’s use your example) came from dinosaurs. They likely didn’t have to reinvent themselves. Dinosaurs already had light bone structures; some had feathers and many other bird like qualities. I agree that it’s highly unlikely they just *poof* generated the necessary organs for flight if they didn’t previously exist.
Scientists and others get themselves in trouble when they begin to take theories whether it is evolution, creationism or even global warming too seriously. They begin to refer to things as “matter of fact” and turn these issues into a religion. Let’s just keep making discoveries and see where it takes us.
There actually are flavors of junk science which are relatively harmless. Evolution is not one of those. Evolution was the main philosophical corner stone for Nazism, Communism, and the various eugenics programs; it is a flavor of junk science with 200,000,000+ dead bodies to its credit. We need to get rid of it.