Are you saying that you're smarter than Einstein?
Tom, the primary evidence for special relativity assumed that the standard scientific view of the world (with the Earth as a sphere rotating around the sun) was correct. That was the whole point of the
http://en.wikipedia.org/wiki/Michelson-Morley_experiment. If you have a flat Earth that isn't moving this is all irrelevant. So why do you believe in special relativity? Also, more directly connected to your question, if you think that that the "are you smarter than Einstein" sort of argument has any validity why doesn't it bother you that Einstein didn't believe in a flat Earth?
Now to deal with ChucK:
The earth is a little over 6000 years old. It is certainly not billions of years old because:
1. The moon is receding a few inches each year. The gravity of the moon would have destroyed the earth if it were billions of years old. (Inverse Square Law)
This is wrong. You are correct that the moon is receding at a few inches a year. The moon at closest approach is around 360,000 kilometers away (assuming standard astronomy so we don't need to deal with weird flat Earth claims at the moment. You seem to be assuming some form of standard astronomy in your claim). That means that if we were to round up and assume that the moon was receding at a rate of 5 cm a year (which is an overestimate - it seems to be close to about 3.8 cm a year) and had been indefinitely then we'd get that around 5 billion years ago the moon would be about 2*10^4 kilometers closer, which would make it about 10% closer. So tides would be bit more extreme but nothing that would be anywhere near destroy the Earth. It is a good idea to actually check the arithmetic before you make this sort of claim.
2. U-236 and Th-230 are both short-lived isotopes. The moon contains these isotopes which it could not if it were billions of years old.
Short-lived isotopes show up all the time. That's because long-lived isotopes like U-238 when they decay form short-lived isotopes so you get a steady supply of them. U-238 has a half-life in the billions of years, and has decay chains that give rise to both of the isotopes you mention.
3. The earth has a decaying magnetic field which would be gone if the earth were billions of years old.
The magnetic field fluctuates over time, and sometimes reverses. We can see that in a variety of items including rocks on the sea floor.
4. Niagra Falls' erosion rate (approx 6ft per year) shows an age of less than 8,400 years.
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True, and so what? That just means that Niagara Falls are young. That says nothing about the age of the Earth. Features change over time.
5. The Sahara desert is expanding. It is the largest desert in the world, and its only 4000 years old. There would be larger deserts if the world were older than 6000 years old.
Huh? I'm not even sure I see the argument here. Features change over time. Deserts sometimes expand and contract. Lots of things can alter this, such as human deforestation, changes in prevailing rain patterns and other effects. There's no reason to think that we should expect to see large, ever-growing deserts.
6. The oldest living coral reef is less than 4200 years old.
This falls into the same category as Niagara Falls. It just doesn't matter.