You're assuming far too much. The premise of micro evolution is held by only a very small population of people, who are not, strictly speaking, creationists.
Micro evolution, macro evolution, special theory of evolution, general theory of evolution and sexual theory of evolution are terms created by evolutionists, not creationists, to try to patch the holes in the evolution theory.
Charles Darwin, the father of the theory of evolution, dispels most of the individual evolutionary theories.
Here, Darwin dispels micro evolution:
To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selections, seems, I freely confess, absurd in the highest degree.
Here, Darwin dispels geologic evolution:
Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain; and this, perhaps, is the most obvious and serious objection which can be urged against the theory.
Here, Darwin dispels general evolution:
For I am well aware that scarcely a single point is discussed in this volume on which the facts cannot be adduced, often apparently leading to conclusions directly opposite to those which I have arrived.
I was a young man with unformed ideas. I threw out queries, suggestions, wondering all the time over everything; and to my astonishment the ideas took like wildfire. People made a religion out of them.
There is a grandeur in this view of life, with several powers, having been originally breathed by the Creator into a few forms, or into one. - Origin of Species by way of Natural Selection
Christ Jesus and His salvation. Is not that the best theory? My favorite book? Hebrews, still Hebrews. "The Royal Book" I call it. - Darwin
Evolution defies the laws of general dynamics. Against the laws of physics and thermodynamics, evolution breaks down at each and every turn.
Genomes can only get bigger or smaller if it can be proved that they evolve in one direction or another. This has never been proved. The gold fish has a more developed genome, if you count numbers as proof, than either the primates or man.