The distinction between "microevolution" and "macroevolution" is not just quantitative, but qualitative. Microevolution notes that a man, with a good run up, can jump over a steam. Macroevolution takes this observation and believes he can, given time, jump the Mississippi!
Your analogy has the drawback that it's, well, wrong. Scientists don't accept macroevolution because they observe microevolution and foolishly extrapolate. We accept macroevolution because of the overwhelming evidence -- from biogeography, from comparative morphology, from fossils, and (above all) from genetics -- that different species are related.
If that is not evident to you, you have never properly understood irreducible complexity.
It is not remotely evident to me, and I'm pretty sure I understand irreducible complexity.
When I saw that, despite having completed my Biology degree, I retrained in IT as I was weary of the intellectual dishonesty of the reductionist scientists. Fortunately, when asked about these issues now, I can comment from the position of someone who applies knowledge and design and using my little bit of wisdom, am able to create something out of next to nothing.
Based on your opening argument, you're also commenting from the position of someone who doesn't know anything about why scientists accept evolution. (By the way, I've been a software engineer and I'm now a computational biologist who sometimes studies evolution. I've yet to see an argument for intelligent design that had any real substance.)
I gave up trying to persuade committed evolutionists a long time ago. As evolution provides a well respected, socially approved cloak for the rejection of God
Well, that's your hypothesis. We can test your hypothesis by looking at what biologists who are Christians think. If you ask around, you will quickly find that the vast majority of them accept common descent, so I'm afraid your hypothesis fails. In reality, scientists accept common descent because it is highly successful and explaining and predicting a wide range of data. Creationism and intelligent design, in contrast, consistently fail that test, either by making no predictions or making predictions that are false.
but just for fun, here is a great clip I recently watched on Mitochondrial Eve.
Yikes. Well, if you're getting your information about evolution from sources like that, it's no wonder that you don't understand what scientists actually think. What she does in that video -- count current mutations and just assume that's the long-term rate at which mutations will accumulate -- is just wrong and guaranteed to give you the wrong answer.