Evolution is both a scientific fact and a scientific theory based on evidence. Evidence includes a wide variety of sources: fossil record, biochemistry, embryology, genetics, taxonomy, DNA, comparative anatomy, atavisms, behavior, biogeographical distribution of species, etc....

Currently, there is no credible scientific evidence that contradicts this idea.

As a science teacher with a major in biology(Bachelor's and Masters degrees), I have studied this for over 30 years. It is a sound scientific principle.

The only individuals that dispute biological evolution are either very religious (and view the theory as contradicting their religious beliefs) or those that lack a good science education. Creationism is considered a pseudoscience by credible scientists because creationists fail to follow the scientific method. Simply trying to refute biological evolution will not convince a scientist. One must also promote a better, rational, alternate explanation.

Good luck with that.