We also don't evangelize like other Christian groups do, and then complain that parishes are closing. We need people to share their Catholic faith with others and live out authentic Catholic lives. 

But some are under the impression this is "proselytism" and are under the impression "if God saves non-Catholics, what difference does it make?" instead of sharing the fullness of the means of salvation. If we don't act like our faith matters, why would anyone else? And doing good deeds like an NGO and hoping that people make the connection that our faith drives us is not enough. 

Also, people have been contracepting and aborting the next generation of Catholics.