ramoss writes:
If the bible is false, we could expect that many nations that have a lick of sense would have sanitary laws, because those that didn't would die out pretty damn quick.
That is not a valid conclusion. You cannot logically draw a positive conclusion from a negative premise. Your statement here would be similar to me claiming that if money doesn't grow on trees, then we could expect it to grow on cars. You see, I am drawing a positive conclusion from a negative premise, and it just doesn't work. To properly come to the positive conclusion that we could expect money to grow on cars, I must start with a positive premise or premises such as the following.
Money grows on things that contain metal.
All cars contain metal.
Therefore, we could expect to find money to grow on cars.
Of course, in this case my premises are false thus making my conclusion valid but false. The goal of deductive reasoning is to arrive at a conclusion which is both valid and true.
To parallel this syllogism about money to my statements about the Bible, I would change it in the following ways.
If money grew on things that contained metal,
And if all cars contained metal,
Then we could expect money to grow on cars.
Notice that here I have at least two positive premises leading to a valid and true positive conclusion. My statements about the dietary and sanitary laws in the Bible were arranged in just this way. The conclusion that I arrived at is both valid and true.
Now, just as I changed my syllogism about money, you can also change your statement to make it valid. For instance, you could say...
The Bible is always false.
The Bible makes ____________ claim.
Therefore, __________ claim is false.
This would be a valid syllogism. I would, of course, argue the truth of your premises, but I would not deny that you had arrived at a valid conclusion based on those premises.
You could even arrange your comments so that I could not argue against either the truth or the validity of your conclusion. You could say...
The Bible makes __________ claim.
If the Bible were always false,
Then _________ claim would be false.
If you were to phrase your statement thus, then it would be both valid and true.