The danger of such an approach to fighting evolution is illustrated by another issue in which some anti-evolutionists argued that there was no mechanism for a geomagnetic reversal and thus the whole concept must be abandoned. As a background, the earth's magnetic field is decaying. Barnes did not prove that a sinusoidal variation was invalid but merely stated that no mechanism for a magnetic reversal, needed for a sinusoidal variation of the field, was unknown and impossible. But the real weakness of this argument is that all it takes to void it is for someone to exhibit a mechanism.
Someone just has.
Other creationists picked up the argument. With such certainty one would naturally assume that scientists would be unable to come up with a mechanism for geomagnetic reversals. But, they finally have one. But I might point out, that the sun reverses its magnetic field every 11 years so such a phenomenon has been observed. The model, which incorporates a finitely conducting inner core, undergoes several polarity excursions and then, near the end of the simulaiton, a successful reversal of the dipole moment.