No creationist I know disagrees with microevolution. it's the magical macro that we have a problem with.
It's not "magical".
It's essentially the same as "micro" - but invariably involving some situation where a population group finds itself in a new ecological niche towards which its prior morphology is not so ideally suited: whether by predators, available food, or climate, nature will select for traits that are more suited to the altered circumstances of the population group in question. That, plus a bit of time (think how much we've modified the shapes of dogs in just 10,000 years - some of which to the point where they cannot interbreed without human medical intervention) is essentially what's required.
Like I said, according to evolution, simple cells formed billions of years ago and were on the ground just hanging around. Yet, they want us to believe we can get insects, animals and mammals from these cells lying on the ground.
I'm not sure what you mean by the idea that cells were "on the ground just hanging around".
Simple cells are thought to have arrived not long after the Late Heavy Bombardment - around 3,900mya. Those simple cells may have resembled prokaryotes, though probably not as complex as modern prokaryotes and certainly not as complex as even unicellular eukaryotic cells.
The last universal ancestor
- the most recent common ancestor of all extant living things - is thought to have existed around 3,500mya, but though that universal common ancestor would have been a single-celled organism, it was probably itself rather more sophisticated than the earliest living things, which had - after all - been around for about 400mya before then.
Cyanobacteria are thought to have appeared around 3,000mya, and given that they produce oxygen as a waste product of photosynthesis, are thought to have been responsible for the ensuing Oxygen Catastrophe and the "Great Oxidation Event" around 2,500mya.
Eukaryotic cells - which are the ancestors of all plants and animals - are thought to have appeared by around 1,850mya - that's more than 1.5 billion years after the last universal ancestor, and following the Oxygen Catastrophe which - while bad news for many early bacteria - was a big boon to eukaryotes. And it was another 800 million years or so before it's thought that multicellular life appeared - and that multicellular life was initially much more basic than insects, mammals and other animals (and plants) - we're talking algae here. The ozone layer is thought to have formed around 600mya - due to the large accumulation of oxygen in the atmosphere - and most of the modern phyla of animals are believed to have appeared between 500-600mya.
That is what the absurd part of it is. Even Richard Dawkins can't explain it.
The problem with questions like this is that they're easy to ask
, but as above, the answers are not in fact as simple as the wording of the questions would imply. (Anyone have a child who constantly asks "Why?" Simple question, isn't it? The answers... not so much.) I am not sure that people know for sure what the "first cells" truly were, which makes it all that much harder to say what the "second cells" (or the first speciation) would have entailed. Paleontologists and geologists have discovered, at least in broad-brush terms, somewhat of the history of our planet, and of life on it; but not all living things leave traces in the rocks, and single-celled organisms that lived more than three billion years ago are especially hard to find.
It's also assuming that such a speciation event would have been the first: if one delves into abiogenetic hypotheses, one may postulate "speciation events" in there where certain biochemical processes worked better than others, and one group became the "first cells", and the other(s) didn't make it. So the question itself may contain a false premise - but I digress.
So the timeline is:
Simple cells = billions of years ago
then we get......what species?
Explain this and I will believe in macro.
You might find this a more useful timeline: http://en.wikipedia.org/wiki/Timeline_of_evolution