I wouldn't say it's the purpose of Christianity, but I'd sure like to think it was part of the end result, as it were. Or at least, is meant to be.
I would say that's a very American-individualistic-Protestant type take. I would say that salvation is meant to be bigger than personal; it's ultimately the transformation of humanity as a whole, and the entire cosmos (creation). So while there are benefits to the self, it's not self-centred.
And yeah, while the absence of death is part of the deal, let's just say I'm not putting too much stock in the idea of an eternal swim-up bar.
I'm pulling a face at the wording; but short version, yes, my church would see its communal life as an instrument in the salvation process.
I think the simplest possible definition of salvation I could give might be, "new life." What is broken is mended, what is wounded is healed, what is lacking is fulfillfed, and what is soiled is cleansed. All of these, though, are metaphors for profound transformation that I would sum up as "new life," (which is why you get other metaphors such as being "born again").
The mindset needed to achieve it (and again, that's not phrasing I'd choose, as if salvation is something we achieve, but I'm trying to be constructive here, so I won't quibble too much), I would sum up as rejecting evil; repenting (turning away from) one's own participation in evil (sin); and turning to God in love and trust.
I do think this kind of approach - conversational, where we can unpack and explore ideas, clear up confusion, and the like - is much more to my taste than trying to put together the dogmatically perfect soundbite.