For starters, the fruit fly experiments conducted over the early decades of the last century amounted to an absolute laboratory disproof of evolution. Several highly qualified scientists publicly renounced evolution as a consequence including the famous case of Richard Goldschmidt. No normal science theory survives something like that; only religions and ideological doctrines go on as if nothing had happened after being utterly disproved in such a manner.
Now wait a sec, not being directly familiar with the experiments to which you're referring, I'm assuming they used fruit flies due to the abbreviated life spans in relation to our own, days to our decades. That being the case, the theories of evolution I've known (and I am a subscriber to evolution as a overall theory) posit that evolution takes thousands of years for even a small alteration in the species to set in (as opposed to individual mutations) None of the theories I've read posit that the changes are brought about by a number of generations passing. So fruit flies within the theory, wouldn't necessarily evolve any faster than other species just because they die quicker.
Am I misinterpreting the point of your example?
What does that have to do with my proposition that when Creationists present an either/or proposition, that either the Bible is true or evolution is true, that it will surely lead to some believers rejecting their faith entirely?
Why are some (but by no means all) Christians so determined to destroy the science of biology by attacking evolution? Is there a point to the endeavor?
If God can do what He will, then He could have easily created evolution. To deny that is to deny the infinite power of God. You are left with a disagreement over Bible interpretation in Genesis I. Bible interpretation fights have occurred within Christianity since the Bible was assembled several hundred years after Christ. Doctrine fights have resulted in hundreds of different "Christian" denominations, none of which can agree on the meaning of the Word of God.
I think Christians should work out their differences between the various interpretations held by different denominations, and then perhaps worry with attacking biology.
Oh, about your fruit fly story. That was almost a century ago. Do you think research confirming evolution ended there? Contradictory findings pop up in science all the time, so pointing out research from long ago that counters recent findings is pretty meaningless.