"I'm afraid you're reasoning doesn't sound very scientific to me. Canyons can be formed very quickly, therefore it's reasonable to assume they all were?"
Yes, Ria, that is very scientific. The scientific method is based on observation and testing. It is the epitome of science to say that what we observe is what we should expect. In fact, it is exactly what you're doing when you say "macroevolution is just microevolution over a long period of time." (This would be a reasonable assumption but, as it turns out, is false for reasons I will elaborate on later.)
"What do you think of carbon dating?"
As you might not be aware, carbon dating is only used to date fossils up to about 50,000 years old. Beyond that, there should be no measurable carbon14 left. Yet, there has never been a fossil that didn't have some amount of carbon 14 left - indicating they are not millions of years old.
What you might be referring to are other dating methods such as potassium/argon and rubidium/strontium which are used to date much older rocks. It is then assumed that the fossils found in those rocks are the same age. I can go into greater detail later as to how all the dating methods work as they are fascinating to learn about and I'm very familiar with them. For now, suffice it to say that all the dating methods contain assumptions that cannot be known accurately. Three are:
- The decay rate from parent to daughter atom is know.
- The initial presence of no daughter atom in the rock.
- That no leakage or transfer has occurred during the process.
I'll also add that the carbon14 method is very friendly to a young earth position. Dinosaur bones purportedly 70 millions years old are carbon dated at less than 10,000. For other reasons, carbon dating points to an earth/sun system which is less than 10,000 years old.
"That species sometimes interbreed proves the definition/concept of species is imperfect, but if you can accept a common ancestor of the canine family, why not extend that further back? Have you heard of ring species?"
Yes, I agree with ring species. But I would argue that it is not the kind of evolution required to turn an amoeba into a man over millions of years.
"You may be familiar with Tiktaalic and other amphibian-like fish."
Yes, I am. My argument from the fossil record is this. Fossils don't form readily. They require special conditions - rapid burial followed by a lot of heat and pressure - like the kinds of conditions after a global flood. Evolution would not necessarily predict a large fossil record. But if a global flood had occurred we would expect to find billions of dead creatures all over the world in sedimentary rock layers which were laid down by water. That is precisely what we find.
Further, if evolution were true we would expect to find many transitional fossils. The overwhelming majority of them should be very different from what we see today. Yet what we find are mostly the same fossils even "millions" of years old looking pretty much the same as organisms alive today. So my conclusion is that the few supposed transitions we have like Tiktaalic are not transitions at all but are simply extinct species. Most evolutionists now reject the fossil record as evidence for evolution because they realize it doesn't support their theory. But it supports mine.
"What would convince you that, say, humans and gorillas share a common ancestor? There's not much difference."
There's a world of difference. The story we've been told that the DNA of chimps and humans is 99% similar is a myth. It was never true. I do acknowledge however that the fusion of chromosome 2 is compelling to me. It's not enough to overturn my beliefs just yet because my view is supported by an abundance of other evidence. But I do find it intriguing and it gives me pause.