could you be more specific?
Long posts are usually a bad idea, so I'm trying to be brief. But if I'm going to be more specific, we need to lay some groundwork.
First, use of the term "evolution" is confused. When you refer to physics, you speak of studying the interactions of matter. Physics will always be physics, but the theories change. The theory of impetus was discarded long ago and replaced with Newton's Laws (and then Einstein's Relativity). Evolution is referred to as a theory, when in actual practice it is treated like a field of study. The theories underlying evolution, like all the sciences, have also changed over time, yet biologists continue to refer to a theory of evolution, as if it's one thing. I think we should stop referring to it as a theory and call it what it is - a field of study. Evolution, then, is not
one theory, but a collection of many, many theories related to morphology, ecology, genetics, etc. If one is to "reject" evolution, then, they need to be specific about what they are rejecting. Unfortunately, to the average biologist, it sounds as if creationists reject all of biology. In my case that is not true. My objections are very specific, but it can take a long time to dig through the mess of misunderstanding to get there.
To the credit of biology, they have separated abiogenesis from evolution. Unfortunately, creationists don't seem to understand that. Much of what they argue about is actually abiogenesis (or sometimes cosmology, geology, or paleontology) rather than evolution. If you ask a biologist, "How did life begin?" they will answer, "We don't know. That study is called abiogenesis, but there is no accepted solution yet."
Next, it is important to understand the difference between quantitative science and qualitative science. Physics is the envy of all science for its ability to be quantitative, that is, to use numbers. It's a goal all science strives for, but not all have reached. What takes its place in some cases is qualitative science, which is based on classifications by characteristic and statistics. It's close to simply being the scientist's opinion, but it would be unfair to take that criticism too far. Qualitative science can be productive, but it's all too easy to hide bad science under the statistics. I'm sure you've heard the quote about lies, #$% lies, and statistics.
Within evolution, genetics (e.g. DNA) is the area that can be quantified. Other areas, such as morphology and ecology are largely qualitative. And guess what the definitions of species are based on ... morphology. Species are a
qualitative assessment. DNA, the
quantitative aspect of evolution, in the strict sense, only deals with individual organisms. The link, then, between DNA and species is subjective. Further, the conditions that create fossils are very special. It is rare that a dead animal becomes a fossil. Therefore, the "fossil record" consists of a ridiculously small sample of earth's life that was preserved under conditions known to be unusual. The process of reverse engineering what the living organism looked like from a fossil is fraught with difficulty, and even if done successfully it is then a subjective exercise to classify the species of that organism and link it to specific DNA.
And yet, that is the process used to link the observed mutations in DNA to the "tree of life". So, while it's easy to demonstrate a change in allele frequency (the current technical definition of evolution), in no way do I believe that supports all life having a common ancestor (i.e. source population), because that claim is based on questionable qualitative science.