First, yes, there are differences among evolutionary scientists as to the exact mechanisms of evolution. For example, does evolution work at a genetic level or on the level of individual creatures/plants/bacterium/etc? Does evolution work steadily, or are there periods of accelerated evolution? However, these same people agree that evolution does work.
The scientific use of the word theory has a very concrete meaning, which means among other things that it fits all the known facts and has never been disproven. Evolution is a very strong theory, meaning that it is very very likely to be an accurate description of nature.
It's an understatement to say that the definition of 'abnormal' varies from person to person. It's a word that has multiple definitions even for an individual. My answer is yes AND no.
If you expect people to be rational, you aren't being rational.