When in doubt,
I am unclear if you read through what you posted since half your post seems to say that you don't agree with evolution and then you have a big section that supports it.
1. Evolution is only a theory. It is not a fact or a scientific law.
As your post shows in science a theory is something that has been repeatedly shown to be true. Evolution is a fact, it was proven by Darwin and there has not been a single scientific discovery that has undermined the simple fact that speciation is caused by natural selection.
2. Natural selection is based on circular reasoning: the fittest are those who survive, and those who survive are deemed fittest.
That is exactly how natural selection works, the ones that survive to reproduce are the fittest. What constitutes fittest depends on the environment. There is only one claim here, we can say something is fit if it survives long enough to procreate, that is not circular.
3. Evolution is unscientific, because it is not testable or falsifiable. It makes claims about events that were not observed and can never be re-created.
It is eminently falsifiable, look up Haldane and pre-cambrian rabbits. Every scientific study since in a range of fields backs up natural selection. Actually we have observed natural selection, there are number of scientific studies that show evolution in action. Look up the nylon bug, a bug with a unique ability never before seen (eating a man-made substance) and found in our lifetime.
4. The disagreements among even evolutionary biologists show how little solid science supports evolution.
Like what disagreements? If you include the name Behe in any example I will laugh!
5. If humans descended from monkeys, why are there still monkeys?
Humans and apes descended from a common ancestor, that ancestor is no longer around.
6. Evolution cannot explain how life first appeared on earth.
Evolution is the study of speciation and adaptation of existing life, abiogenesis is the study of how life started. Evolution by definition cannot explain how life started.
7. Mathematically, it is inconceivable that anything as complex as a protein, let alone a living cell or a human, could spring up by chance.
Natural selection is not the same thing as chance. The clue is in the name.
8. The Second Law of Thermodynamics says that systems must become more disordered over time. Living cells therefore could not have evolved from inanimate chemicals, and multicellular life could not have evolved from protozoa.
The second law says systems lose energy, there is nothing to stop you adding anergy to create a more ordered system. The sun in our system adds energy every single day. Think of it like a car, there is a limit to how far you can travel before you have to put more energy back into the car in the form of petrol.
9. Mutations are essential to evolution theory, but mutations can only eliminate traits. They cannot produce new features.
See the nylon bug, a new feature caused by guess what? A mutation!
10. Natural selection might explain microevolution, but it cannot explain the origin of new species and higher orders of life.
That is precisely what evolution and natural selection prove, that time plus selection pressure causes speciation. See ring species if you want an interesting example of how speciation works. The 'higher orders of life' presumably mean humans? I can provide examples if you want to define what you mean.
