The atheist's response

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Well, I'd say he's wrong in how he schematized the evil-religious argument. It really should be "Good doing evil" (Q, in his example) implies "religion" (P). So Q->P. And so ~P->~Q. Your argument stands.

Another way to strengthen your argument is to say that perhaps while fundamentalists accept his definition of faith as absolutely true and therefore feel like they have more faith than moderates, moderates and liberals tend to lean towards a different definition. At least, that's what I would do, predictably. ;) I would say the liberal definition and suggest that the moderates, while intellectually they may agree with his definition of faith, in practice they intuit the liberal definition, keeping them from doing the crazy things of fundamentalists.

It's not that moderates and liberals have less faith. It's just that the way they define and practice faith less and less requires them to go against logic. And if he insists on keeping his definition of faith (which is a rather modern one), then screw it. Let him keep it. We'll have to think up some other word. Because it is *obviously* used in more than one sense within religion.
I"m a noob when it comes to logic. So could you tell me what "->" and "~X->Y~" mean? I don't understand the symbols. :D
Right. If religion (or adhering to a particular religion) is the only reason why good humans (i.e. humans who tend to do good actions) commit evil actions, then a good human who is not religious (or who does not adhere to a particular religion) could not commit evil actions. But we already discussed that I guess.

And I would say the main problem with religion is not necessarily that it breeds crazy fundamentalists who blow themselves and others up. Sure, that's bad, but also very rare. The problem is that it justifies rather bizarre ideas like "Gay people shouldn't be allowed to get married" or it stunts medical breakthroughs by opposing stem cell research. And the thing is, such ideas are not just prominent with fundamentalist crazies. Such ideas are prominent with many moderates as well. And when there at that many people holding to such ideas, it's time to whip out the beat stick and start, well, criticizing (no, I don't actually advocate literally beating people).
"->" means implies. if you see "x->y" that means if x, then y. "~" means not.

And there is rule in logic that if "x->y" is true, then "~y->~x" is also true. But it is wrong to say that "~x->~y", which is what he accused you of.

Example: If you are a human, then you are a mammal. That's true. It's also true to say that "if you are not a mammal, you are not human." But it is false to say that "if you are not human, then you are not a mammal."
So for a good person to do evil things (P) implies religion (Q). Thus, without religion (~Q) implies that good people are incapable of doing evil things (~P). But it is wrong to say that a good person is incapable of doing evil things (~P) without religion (~Q)?
Right. And one of the most common ways to argue against a P->Q type argument is to take ~Q->~P and disprove that. Which is what you did.

I don't see a significant difference between ~Q->~P and ~P->~Q. They are essentially saying the same thing, aren't they?



~Q->~P is denying the consequent, a valid form of argumentation whereas ~P->~Q is denying the antecedent, an invalid form of argumentation. So take the argument:

If P, then Q
Not Q (denying the consequent)
Therefore, not P

An example:

If person X steals something, then X is a criminal
X is not a criminal
Therefore, X did not steal anything (valid)

Compare to:

If P, then Q
Not P (denying the antecedent)
Therefore, not Q

If person X steals something, then X is a criminal
X did not steal something
Therefore, X is not a criminal (invalid)

Applying this to the Weinberg would look something like:

If a good person X does evil (P), then X must be religious (Q)

X is not religious (~Q)

Therefore, X cannot be a good person who does evil (~P) (Valid)

If a good person X does evil, then X must be religious

X is not a good person who does evil

Therefore, X must not be religious (invalid)
I see. Thanks for this.

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Koios

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Koios
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"Every religion is true one way or another. It is true when understood metaphorically. But when it gets stuck in its own metaphors, interpreting them as facts, then you are in trouble." -Joseph Campbell
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