We can state it, evolution is the gradual change of species, or sections of species, into at least 1 and possibly many other species. It's actually pretty straight forward. The only people I see making evolution "evolutionism" are the creationists, they're the ones that try to brand it as all kinds of things it isn't. It's not a religion, it's not an imperative, it's not a support for any kind of politics philosphy or creed. Evolution is the same thing any other science is: an attempt to explain the known facts of the world around us. Nothing really terribly exciting or threatening about it to anybody or anybody's belief system.
You 'fact' of evolution, then?
Leaving aside the rather vague pronouncement, however you define it, whatever you mean by it - do you have any theories as to what might have caused this to happen?
As a matter of fact evolution is rather hard to teach to non-scientists.
I (long ago and in a galaxy far far away) taught biology to non-science majors.
Never even got near evolution. Tried to do a bit of classification, objectivity, reproducible results, effects have causes....plus some data bits.
Extremely tough. Different mindset. A few would break through. Many found understanding actually objectionable... made them "cold," diminished the importance of feelings,
and, from my observations, made some afraid that established dominance heirarchies among themselves would crumble.