Feivel said,
“genetic mutations, which are the only mechanism capable of adding something truly “new” to the gene pool are almost ALWAYS injurious”
This statement is simply just false.
For example the average human being typicly has about 50-100 mutations of which 3 actually change a protein (they are not what are known as “silent” mutations which dont change any proteins and have no real effect on their organisim whatsoever),if the vast majority of mutations were injurios as you claim, humans (and all other life for that matter) would have been extinct long ago.
Most mutations that actually change a protein are neither harmfull or beneficial in of themselves, rather are simply diffrent.
If the vast majority of mutations will prove to be harmfull or not would depend on the enviroment were the organisim which has any particular mutation finds itself.
(For example a mutation that causes an animal to have darker skin will prove beneficial to the animal if it finds itself in an enviroment with a dark surface as it would make it harder to spot but harmfull if it finds itself on a light one were it will make it easier to spot.)