Yes. Humans evolved. And as a species, we are still evolving. Every population of species is constatly evolving. Environmental pressures and generative rates do of course mean some evolve "faster" than others, but evolution is still occurring. Even very slow-breeding species in very stable environments are evolving, through what's called 'genetic drift."
As for our ability to cope with disease and parasites, I think you might be surprised. New diseases, of course, create a fairly horrific toll among a species. Such as the impact that influenza, smallpox, and measles had on Native Americans... or the effect syphilis and bubonic plague had on Europeans. Rapid, catastrophic death tolls, like "judgement from god" stuff. But there were survivors of the pandemics. There are always survivors, so long as the base population is large enough. Those survivors have stronger immune systems, which get passed on to their offspring. Who breed with other resistant offspring, and so cement disease resistance. It may take multiple generations, but it'll happen.
We're probably fucked, yup. Our great-great grandchildren will manage, though.
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