True, and what differentiates evolution from creationism and ID is the range of predictions that can be checked. Most spcifically the nested hierarchies of similarities and differences among living things.
I would have to say that I am not quite a literal Creationist, but I sympathize with both ends of this spectrum and want to see what might be in the gap between the two ends, that of intelligent agent intervention or design at some time in the past.
If Evolution has a quantitative theory, it would be a useful baseline to compare to observation.
Exobiology, if it find examples of life on other planets in our Solar System or inferred from observations of spectra of planets around other stars, can provide data points to compare to the Evolutionary model.
Panspermia, unintentional transport of life across interstellar space, or even directed dispersion of life forms, are all possibilities.