The phrase "among the quick" is often used to refer to those who are alive, in contrast to those who have died. Some synonyms for this phrase include "the living," "the breathing," or "the animated." Another way to express this idea could be to use the term "mortal beings," which conveys our temporary nature and the fact that we will all eventually pass away. Other options may include "the extant," "the surviving," or "the existent," all of which evoke the idea of people who are currently present and accounted for. No matter which term you choose, the important thing is to clearly convey the concept of people who are currently living and breathing.