As a young Christian, when I was presented with the view that Christians must believe in a young-earth and global flood, I went along willingly...One also finds erosional canyons buried in the earth. These canyons would require time to excavate, just like the time it takes to erode the Grand Canyon...And being through with creationism, I very nearly became through with Christianity. I was on the very verge of becoming an atheist.
This is a stereotypical narrative for many apostates. When they lose faith in creationism, or some particular claim thereof, they lose faith in Scripture.
At the risk of stating the obvious, Genesis never mentions the Grand Canyon. Genesis doesn’t say the Grand Canyon was formed by the flood. Genesis doesn’t say anything about the origin of the Grand Canyon one way or the other.
Morton is like a man who views a painting through tinted glasses, then when he decides the color scheme is off, throws the painting away rather than the glasses.
It’s important to distinguish what the Bible actually say from theoretical constructs. Losing faith in some theory about the formation of the Grand Canyon is not logically equivalent to losing faith in Scripture.
I’m not debating the pros and cons of flood geology right now. And I’m not qualified to debate that issue in any case.
Rather, I’m drawing attention to a common confusion among apostates.
With sufficient ingenuity, you can come up with scientific theories to explain just about anything. You can start with the same data and come up with competing theories which are empirically equivalent.
Don’t confuse rejecting a theory with rejecting the Bible, especially when the theory is far more specific than the Bible. When the theory talks about things on which the Bible is silent.