Oooo ouch. Having a similar upbringing I can imagine.
Eh. It's all right. I enjoyed annoying the teachers by knowing more about science in the 6th and 7th grade than they did. And on friday nights Dad and us kids would listen to Black Sabath.

My dad went to a seminary, oddly enough....
Near the end of the flood, the compression event crushed and fractured rock, producing additional electrical discharges. Hot SCW (held in the spongelike voids in the lower crust) and 222Rn (an inert gas produced in plasma channels) were forced up through these channels and fractures. As the mineral-rich water rose hours and days later, its pressure and temperature dropped, so minerals such as biotite and fluorite began forming in the channels. Wormlike myrmekite also formed as quartz and feldspars precipitated in the thin, threadlike channels “drilled” by the powerful electrical discharges and by SCW (a penetrating solvent).
Hm....I suppose we're to ignore the fact that biotite isn't generally formed via precipitation from aquious solutions (it's more commonly weathering product of feldspars), and that such electrical discharges are (as far as I know, and I'd know) completely unknown in geology, and that the lower portions of the crust are anything BUT sponge-like (groundwater volume decreases with depth), and that no "wormlike" structures are found in the majority of sedimentary rocks, and there's no evidence for the lightning (vitrification, or other high-temperature-low-pressure phases in sed rocks), and that such "penetrating solvent"s are not found in fluid inclusions in, well, ANY sedimentary rocks, and....
Before the flood, SCW dissolved granite’s more soluble components, such as quartz and feldspars,
Check out Bowen's Reaction Series. It's false (it's an over-simplified version of a phase diagram), but it's one of those useful lies we use to teach freshmen in "rocks for jocks" classes about mineral precipitation. Sure, quartz can disolve, fairly easily in some cases--but it's HARDLY the "more soluble component" of granit.
As the hydrothermal fluids rose, their pressures and temperatures dropped, so quartz and feldspars came out of solution and sometimes grew large crystals called pegmatites.

Pegmatites don't grow that way. They grow (simplified, of course) as part of the final stages of an igneous intrusion, when the amount of water reaches a certain point and the geochemistry goes crazy (not a geochemist, so I don't get it--it's all just "low sensitivity igneous facies" to me, but this is the gist of it [ETA: by "go crazy" I mean "alter from what we typically consider the 'normal' state", not "violates the laws of physics/chemistry or anything so stupid"]). There's precisely ZERO evidence for these hydrothermal channels Brown hypothesizes.
You want to argue otherwise? Okay. Go to Ruby Mountain in Colorado. Go north 2 or 3 km. There's a number of pegmatitic formations in that area--quarz and feldspar, primarily. Find evidence of such hydrothermal activity. This area is VERY well surveyed, and any such information would be of incalculable value to geology. Should be easy enough to find the literature on the geochemistry of the area (I found it in all of twenty minutes five or six years ago). Yeah, I picked somewhere I've been--but someone has to check your work.