A few points, LP --
1. Macroevolution -- as in a change from bacteria to bears, vs simple variation within type -- is unproven and unsubstantiated by anything known in genetics today.
2. "Fundamental unity" points to a single designer far more than to a single point of origin.
3. Saying that the different fields all point to the same 'tree of life' is a total lie. First of all, the term is now 'bush' or even 'forest' among evolutionists and, second, there have been ongoing and occasionally raging battles among various evolutionary fields about which bush or forest or tree is correct. You need to avoid what TO says, by the way, as they are no way wedded to the truth in their massive efforts to defend evolution.
4. The ontological argument has long since been discounted by geneticists as, first of all, it is debatable whether these are 'limbs' as referred to in your post and second of all, they are controlled by very different sections of the genome.
5. "distribution of fossils" disproves the argument about distribution of species. Marsupial fossils are found in S. America. Of course, saying that so-called anomalies can be explained by continental drift means that the anomalies exist and that an excuse must be made for them. In the meantime, no one is disputing diversity within types, such as squirrels, which comes from both ecological pressures and isolated breeding populations.
6. Genetic similarities are taking into account, metaphorically, the bricks of the building without taking into account the buiding directions. These genetic differences -- the stuff between active genes -- are where the timing and expression information is and which cannot be explained by evolution.
7. This bit: When two organisms evolve the same function independently, different structures are often recruited. For example, wings of birds, bats, pterosaurs, and insects all have different structures. Gliding has been implemented in many additional ways. Again, this applies on a molecular level, too. is basically saying that there are enough differences in what appear to be similarities that evolution has to reach into its never-ending grab bag of excuses and tricks to explain what it is actually finding vs. what it predicted it would find.
8. The human throat and respiratory system are exquisitely designed so that when we are stuffed up from a cold, we can still breathe! If these two systems were as separate as evolutonists think they should be, our necks would be so thick we would not be able to turn our heads.
9. The idea that much DNA is nonfunctional is rapidly disappearing down the tubes as it is being discovered that all those 'junk' sections actually have significant purposes in timing and linked expressions. Calling them nonfunctional is more an evidence of our ignorance than of anything else.
10. No one is arguing speciation. That is a red herring.