FYI : half of the evolution theory is technically scientific. micro evolution, or if you prefer speciation, is observed, and therefore scientific. that is, that through natural selection, species of animales can change and adapt to the point of being a different species from the original species. that is, there is not immutability of species.
however, macro evolution, that is changes from sub phyla to sub phyla, from family to family, or if you prefer goo to you via the zoo, has never been observed, and therefore is not scientific by definition. it is an educated guess, never backed by any actual observation on behalf of darwin. he stretched his conclusion that since species can change from one to another, then they can chnage from one animal to another. so besides the fact that has never been observed, it is an impossibility due to irreductible complexity. read up on the matter. a non christian author, Michael Denton, has a sweet book called Evolution: A Theory in Crisis, if you'd like.