Also a pre-Flood vapour canopy would have inhibited formation of carbon14 in the upper atmosphere, so items dated soon after the Flood would appear much older.
By what mechanism does our Creationist friend think that a "vapour canopy" would inhibit C14 formation, I wonder?
By what mechanism would the "vapour canopy" remain in the atmosphere?
By what mechanism would light pass through the "vapour canopy" to allow life to continue to exist?
Most importantly, what extra-Biblical evidence supports the existence of such a "vapour canopy?"
The vapor canopy model presents such a deluge of issues that those who still think it holds water can only be described as vapid.