I’m not sure what your experience with a person who rejects the evidence of evolution has to do with assessing the education of kids.
The fact is that even if a larger and larger percentage of the populace didn’t accept the evidence for evolution year after year, it would still be relatively easy to assess whether or not a student was learning what all people need to know (reading, writing, arithmetic).
Considering the fact that nearly one out of five high school graduates are functionally illiterate, it seems rather silly to focus on whether or not students’ personal beliefs are conducive towards accepting the progress made possible by the scientific method.
If a student is a racist, simple conversations are a better remedy than testing their ability to regurgitate the facts we insist that they temporarily memorize.
I think we should work on the basics (reading, writing, arithmetic) before we decide that every single student needs to believe that evolution happened.
Adults who can’t read or write or figure simple percentages are a much bigger problem than adults who don’t understand genetics.