Yes. In the absence of mutation, evolution would continue to occur through the contributions of other mechanisms of variation that are active in populations.
This has long been known in science and it surprises me to see those claiming full understanding do not know this information.
Are they wrong in their personal assessment of their own understanding and thus rejecting science on grounds other than understanding?
It seems so.
If I promote a position and use an external source in that promotion, it is I that is making the argument and not my source. So, it is I that has to continue the argument or admit that I have failed to support my argument out of my own ignorance.
If I were to pass the buck and declare that the real argument is with the source, would I not be diminishing myself and revealing that I'm ignorant of the difference between basic introductory material intended for an audience of limited understanding compared to the knowledge of those with obviously deeper and fuller understanding?
In such an event, I would have to admit defeat and recognize that I don't really have the sort of understanding that I had been continually protesting that I possess.
Wouldn't it be the Christian thing to say that I reject the conclusions of science on the basis of a literal interpretation of scripture and not out of an understanding of the evidence? Wouldn't it be the right thing to say that, despite the evidence and scientific explanations, I cannot reconcile the existence of the evidence with the claims that I accept without evidence?
Those seem to be foundational to these discussions and how they are personally answered drives the desire to force observation to fit a pre-existing narrative.