Michael Flynn (who is a Catholic, and an evolutionist) takes a certain pleasure out of ribbing these guys.
He also has excellent depth in philosophy and reasoning. I can't do justice in summarizing it. You really must read it.
The really remarkable part is down a ways:
"There is no distance at all between grasshoppers and locusts. The latter are just grasshoppers that have 'gone Hulk.' If we didn't know up front that they were the self-same critters, we'd be tempted to classify them as separate species. The same genome is used by both. The difference is that what the genome does depends on environmental cues within which it does it."