Grassi says Francis will make big changes in āsmall stepsā
Envoy has visited more than 20 countries since April
Yayo Grassi and partner met with pontiff in D.C.
Pontiff cites ānatural differences between man and womanā
Health Minister calls change āscientifically and technically accurateā
Vatican has yet to respond to meeting request with LGBT Catholics
Envoy just returned from 11-day trip to region
Randy Berry to visit five countries during 11-day trip
Giniveth Soto killed in Caracas as someone tried to steal car
Advocates sharply criticize church at end of two week meeting