Religion is a product of society. Religiousness is what every human experiences time-to-time.
I cannot say anything about religion, because no matter what, it is something deeply entrenched in the society. Religion is a sensitive topic, and therefore, I think religion should be relegated to one's private life... to start with ~ as it has become a sort of social identity. So, then, one can really see how people will start dropping religion.
Basically, religious feelings are very deep, close to each man's heart, and discussing it, questioning a man's religion, only makes it lose it's sanctity. A step forward in this would be to stop asking people their religion in application forms, and slowly the people must also change their mindset, and keep the religion or their religious feelings within in the premises of their homes.(I'd say heart but, man wants to express always). Actually I think one cannot express or discuss his religious feelings FELT by him.
Anyways, isnt it wonderful how most people in China have no religion? But does that mean they do not experience religious feelings?? They do... inside their heart.. that is beautiful, has it's own sacredness, depth and simplifies the life... giving way to original spiritual growth.