If you admit that micro-evolution exists, then consider this. Supposing a wee fly undergoes an event of micro-evolution, then a couple of generations later one of his offspring goes through another micro-evolution event. Continue this for thousands of generations and consider how many individual micro-evolution events have occurred. May they not all add up to what you consider macro-evolution? Nobody has ever seen it, not because it doesn't happen, but because it takes so long for it to happen that no-one who was around to see the original will be around to see the progress. Is this so difficult to grasp?
Consider this. Syphilis, when it was first introduced to Europe caused a very severe illness which was usually fatal within 10 days. Now, the bug causing it can't live outside the human body so when the host died, it died too. Since the people who caught it were so ill and died so rapidly they didn't get a chance to pass it on. So without changes to the bug, syphilis would have died out in Europe. That didn't happen because those strains of the bug which were slightly different ie less able to cause the disease, had more chance of being passed on because their host wasn't feeling as bad and was more likely to take part in rumpy-pumpy. Continue that for a few hundred years and we now have syphilis which bears no resemblance to the original disease. Now the infected person gets a painless sore at the place of infection which heals. Then a while later they get some ulcers on mucous membranes which heal. For some that's it, for others they develop general paralysis of the insane and gummata in various organs, aneurisms in the aorta etc and they eventually pop their clogs maybe thirty years after the initial infection.
If you compare the two lots of symptoms side by side and don't take into account the time involved, you'd be hardpressed to see that they were caused by the same organism or that they were the same disease. We know that they were because the changes were GRADUAL. Mark that word GRADUAL!!! Each change increased the life expectancy of the individual a tiny bit and decreased the severity of the symptoms. Does this help? Probably not, methinks. Ho hum!!
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