I think Montague is making a distinction between assuming there isn't a god before giving evidence, and asserting that there absolutely-for-certain
is no god.
Of course, "atheism" as a term covers both categories, so he's wrong regardless.
You have to take certain assumptions.
Out of all religions, the Abraham ones are the ones that send you straight to hell for not believing. Out of this, Islam canonically accepts Christians and Jews as a sort of side-bet loser and they don't typically go to hell. Other major religions don't have such terrible afterlives for non-believers or heathens. Mormonism is like that, too. Christianity offers the best odds. Of course there is always the chance that the One True God is actually nothing at all like any major world religion, but thats not likely, considering any really vengeful or spiteful god will have a greater following.
I'd put my chips on Christianity. Eastern Orthodoxy, if you have the time and money to spare, but even Unitarian universalism is better then atheist. Atheist is a sure fire way to go to hell no matter who you talk to. Its like hitting on a 20.
Why are you only taking such a select few religions into account when in reality there is an infinite and uncountable number, as I stated earlier, of possible belief systems, deities, and afterlives? Why are you pretending to even know what "all sides" are here? What about the, again, infinite and uncountable number of hypothetical deities who would put you into heaven for being an atheist, or for wearing the right colored hat, or for killing yourself by leaping off the international space station? It's pointless to even draw up a table of possibilities, since... okay, I hate to repeat this, but
the possibilities are infinite and uncountable and there is no way to ascertain the relative probability of any of them being true, as Pascal's Wager is meant to work regardless of any evidence for or against an individual belief structure (it's merely a zany game-theory thing).
Nah, because with a god that only accepts atheists, you'd have that rebellious element that would still hate the god that sent them to heaven and then it would be a sort of hell for these types of folks, since they'd find the whole idea of their afterlife repulsive.
I'm an atheist. I would be totally cool with going to Heaven. I mean, seriously,
why the hell not?
Also, to assert there is no god, is an unfounded one, because by the very nature of a God we have to assume its impossible to know if one exists or not.
If it's impossible to know if an entity even exists, then for all intents and purposes it does not, as the ontology of that entity has absolutely no bearing on us whatsoever. It's like asking "What might be in another universe that doesn't interact with this one whatsoever?" -- if there's no way to know, then there's no reason to entertain the idea in the first place.
So to be an atheist is to deny the possibility of any sort of deity. While an apatheist just doesn't care if one exists or not and an agnostic recognizes that there may or may not be a deity. Atheism is an assertion, like being a theist, while others simply adhere to assumptions.
No. See above.