My mistake. No matter who said it, it is a false dilemma.
No, I didn't mean that, the idea of using the genealogies goes back a long way. So do ideas like infant baptism. Just because they have been around a long time doesn't mean they are right and appropriate.
I have not heard of these "many scientific problems" from credible sources. Our understanding of radioactivity seems rather solid, and we make reliable predictions from our understanding of radioactivity all the time.
That makes no sense if you actually look at the fossil record. There are too many layers of strata for that to explain much of anything. If the largest and more complex animals were clustered in what would appear to be a high spot, that would be evidence for your theory, but that's not the case.
I'll grant you the premise -- if the "Genesis Flood" and Ice Age you describe actually happened when you described them. Land bridges could have been uncovered through that part of the world.
So your premise is that the entire earth was covered by volcanic activity after mature life (including human life) developed? It's weird we don't hear about that in Genesis where volcanos were exploding constantly and releasing enormous quantities of ash and lava throughout the earth, choking out life.
Moreover, the biggest problem with your Mt. St. Helens explanation is that the vast majority of the layers are sedimentary layers, not layers of volcanic material. And I don't recall Mt. St. Helens creating ANY canyons. In 1995, I toured Mt. St. Helens and the surrounding region (about 15 years after the major eruption of 1980) and didn't see anything that resembled a canyon. Please enlighten me as to how Mt. St. Helens "showed how...canyons formed."
I have personally examined Mt. St. Helens, fossilized coral reefs in West Texas and New Mexico, explored road cuts and located fossils, and have examined strata in at least five major canyons in the American West. I am well aware of the Enlightenment (and critique it rather harshly in some areas), but it does not change the obvious evidence that the earth is extremely old.
Salt water lakes and ponds would not explain the reefs. Moreover, we have the example of the Great Salt Lake in Utah, which I have also visited. It does not have coral reefs or reefs that resemble the prehistoric reefs in Texas and New Mexico. However
it does have algae that creates deposits, but nothing like the enormously tall structures I am referring to.
So in short, you really don't have any evidence or explanation that disproves my reasonable interpretation of the evidence for an extremely old earth.