I think that's far closer to the site's actual purpose. Destroy the Bible's credibility, and you destroy a good deal of the justification for believing in its deity, or changing the world in the way the Bible demands.
I guess, but it really should stress at best that it's "putting into question the credibility of a piece of evidence for the existence of God" rather than "proving God doesn't exist". And it becomes an especially silly "proof" if the person doesn't believe that the Bible is necessarily a piece of evidence for the existence of God in the first place.
The name of God is an excuse, everything done in religion's name would be done under another garb if it didn't exist
I don't think it's possible to generalize to that degree (doing so would require a somewhat deterministic viewpoint, and a view that some people are just fundamentally evil no matter what their surroundings), but it is probably the case that the overall sum of bad things done probably wouldn't change much if the worse religious fundamentalist organizations were replaced with comparable nonreligious fundamentalist organizations.
I would say that toning down fundamentalism
in general could have a positive effect, though (of which forms of religion is one possible type).
It's not even "religion," it's Christianity. It's always Christianity, to the point where atheists will assume theists are Christian and argue as such.
To be fair, the site is called "
God is imaginary". Capitalised God (ie the name) often specifically refers to the Judeo-Christian one.