For the purposes of this thread, we are focusing on the idea of separately created kinds as part of ID/creationism compared to common ancestry between these groups.
We have heard proponents of separately created kinds state that their idea explains the gaps in the fossil record. I think something more profound and fundamental is being ignored in that statement. How does ID/Creationism determine where the gaps are?
For example, we can start from a set of larger species groups: birds, amphibians, lizards, dinosaurs, mammals, and fish. Where are the gaps between these groups? Is the gap between birds and mammals? Is the gap between fish and dinosaurs? What are the fossil gaps according to ID/Creationists, and why do those gaps exist between those specific groups and not others?
The only way I can see to make sense of this is if life evolved from common ancestors. That is the only way we would expect to see specific gaps between specific species groups in the fossil record. Why else would we expect to see transitional states between groups if not for the nested hierarchy that common ancestry produces?
In contrast, do we see gaps in designed things? Is there a gap between a Ford sedan and a Chevy truck? What types of features would we expect to fill in gaps in things like vehicles? Is there a gap between cars and airplanes? If we have several groups of vehicles, how would one go about identifying what the gaps are between them?
Gaps in the fossil record are not evidence against evolution. They are actually quite striking evidence for evolution. Only through evolution from common ancestors would we expect to be able to identify gaps in an incomplete fossil record.