That all present life descended from earlier forms, over vast stretches of geologic time,is as firmly established as Copernican cosmology.
Biologists differ only with respect to theories about how the process operates.
Their advocates and practitioners generally regard attempts to alter them as hostile. Sciences advance by accomodating themselves to change as new informationis obtained. In the psuedosciences, a challenge to accepted dogma is often considered a hostile act if not heresy, and leads to bitter disputes or even schisms.