Often when debating people who do not accept evolution, it is clear that they don't accept it because they don't understand it. The version of evolution they carry in their head is so warped and absurd, I'd reject it too. Typical are comments like this from Raymond at #67:
"The question, then, is if a new species were to result from some arbitrary genetic mutation, with what does that new species procreate? Even if the assumption is that a new species does not appear suddenly in one individual but rather evolves over a long period of time, problems remain. At some point the first of the new species which could not interbreed with its forebears most have appeared so with what did it then procreate? Also, if it happened over a long enough period of time for evolution to have worked its slow magic, then why do we not see more evidence of it in the fossil record?"
Raymond is working from a common misperception, that of the "hopeful monster", a creature that mutates so far from his parents that he cannot breed with them or any other members of his former species. This is the fiction of many a science fiction story (eg X-Men), big on shock and gore value, small on science. It is represented on the right in the exhibit below. The way speciation actually works is shown on the left:
As we can see, there is no point where the group on the left cannot breed with the previous generation, because the change from one generation to the next is very small. It is only the accumulation of many such changes over time that eventually produces a new species. One wonders how many people would still reject evolution if they actually had an accurate picture of what it is.
Hat Tip: PZ Myers