why don't atheists support scientology?

[Sword of Christ]

Quite possibly.

It's possible that a pink unicorn will fly out of my ass as a well.

The truth may not always be pleasant but that doesn't make it any less true.

I didn't say it would be, what's the point of salvation if there isn't something unpleasant in our nature? The reality of death and suffering in this is unpleasant as well no faith will take that reality away. But if you're laying in the gutter you chose to look up at the stars or lay face down in the shit. You aim yourself toward heaven not into the ground.

If it's true that there is a god out there who will torment unbelievers forever

They will torment themselves. If someone truly rejects God, truly hates his works and humanity and rejoices in their sins then Gods love for them will burns like a fire. You can see hell as dark shadowy realm or state where such beings go to try and hide away from his sight. Certainly fits with Biblical description as Jesus describes it.

, it doesn't matter that I find that to be an utterly contemptible and illogical concept.

I'd be a bit careful there, Pascals Wager may be complete balls but try not to find the ultimate source of the universe, everything that is good in humanity the force of love, humility and justice contemptible even if you can't believe in it's reality. Try to at least like the idea, live as Jesus or Buddha or whoever would, try not to be a cunt.

By the same token, if it turns out that there is no god and no grand and great "purpose" to the universe, then it doesn't matter that it might make anyone feel a bit empty to contemplate it.

It will still matter greatly to other people even you apparently don't care either way. If you like the idea of being a lumbering robot whose only purpose is to serve as a vehicle for the DNA that controls it as Dawkins put it then you can believe that. It doesn't mean you're right or have any particularly good arguments though.