Hi Slevesque
Sorry I haven't had time to read all the other posts, so sorry if I repeat anyone else's response to your first statement.
You say: "...I never rejected the fact that there is change over time within a given population of anything, including bacteria...
But I hope you will agree that this does not equate to common ancestry evolution, which is what creationists reject."
This would mean that if you took, say, a culture of bacteria and divided it into 2 or more isolated cultures, they would all only evolve in 1 direction in exactly the same way.
If any of the isolated cultures mutated differently, then you would end up with different bacteria, with a common ancestry. Unfortunately for the creationist theory you mention, this has been proven to occur in experiments with bacteria and multi-celled lifeforms. For example, an experiment involving a species of guppies that was divided into different pools with different conditions found that the newly separated populations very quickly evolved differently. The different guppies all have a common ancestry.
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