I think you're wrong on several counts.
I don't know that anyone has ever denied adaptation. It's apparent even in our own lives. Calling it "micro-evolution" is just a gamut to build support for Darwinian evolution among those who lack understanding.
Second, I don''t think anyone has attempted to "warp" a passage of the Bible to confirm or deny adaptation exists. Can you please provide an example? This sounds suspiciously like your own anecdotal evidence which, for a scientist, should be pretty taboo.
Third, you claim that Christians used to think the world was flat, but you've ignored the fact that Egyptians, Babylonians, Baal Worshipers, and others also believe this to be the case. The whole population of the earth once believed the earth was flat; calling out Christians on this only seems very biased.
Which merits another mention: you've gone from "Creationists" in your initial question to "Christians" in your follow-up information. Clearly you have a beef with Christ-followers only, or you'd mention Muslims, Jews, and other Creationists as well.
To answer your incredibly biased question, I'll certainly believe in Darwinian evolution if and when the difficulties in the theory can be worked out. It's one thing to say that macro-evolution and micro-evolution are the same thing on a different scale, but it's another thing entirely to prove this assertion. There also needs to be a way to demonstrate that abiogenesis is a viable, sensible, possible process; so far controlled laboratory experiments all fail to do this. There also needs to be a cohesive way to explain the enormous gaps in the fossil record and the sudden emergence of wholly developed body types; current claims of "punctuated development" are a possible answer, but there is almost zero evidence to support this claim.
In short, I'm a firm believer that all truth is God's truth. I'll believe in the theory of Darwinian evolution when it's demonstrably true. I get edgy when anybody says "We can't show you that," or "We can't make that happen in the lab yet," or "We think it happened this way," and then follows it up with "but trust us." The majority of those who promote Darwinian evolution are beholden to the theory; they have no other alternatives.
I admit, my frustration with my fellow Christians is over the Big Bang theory. I am always surprised when a Christian rejects Big Bang cosmology.
Big Bang is good science. Unlike Darwinian evolution, Big Bang is scientifically sound from top to bottom. Big Bang is the most-tested, best proven science there is.
And it's also good theology. The Bible literally screams Big Bang. When science said the Universe was static and eternal, the Bible said (more often than any other aspect of creation) that the Universe was stretched out (past tense) and stretching out (present tense.) The Bible has it right about 5,000 years before the scientists did.