Mainly because the idea of settling on a belief rather than trying to prove something with irrefutable evidence is a flawed way to answer the most important questions and most folks want more than "God did it" when they wanna know how something works.
A lot of intellectual and cultural stagnation occurs that way and this has been the case for a long time. It's not a case of wanting to destroy religion out of spite, but rather trying to break the mold that's been set for ages.
I partly agree, actually. People like Galeleo were super held back by the old Catholic church simply because they wanted to believe that God is constantly magicing eveything always. Of course, scientists have found that its not so simple, and society has benefitted from that immeasurably.
However, if we look at how amazingly tbe world and the universe works from the grandest galaxy to the most miniscule interaction of particles, it.becomes harder for me, and others like me, tbat the universe merely spawned into existance by chance and that you and I stand here today typing on computers about this debate and thinking so deeply about this because we just happened to spawn into existance some millions of years ago against all odds. To me, it makes sense that some grand, inomprhensable being has created the world because of how inexplicably well it is designed.
I cannot speak for everyone, but I think the more we know science, the more magnificent we see God. I think that the pursuit of knowledge is quite noble, yet the more we learn about the universe, the more we know that we know nothing about how the universe. Science does ot disprove God, it only makes him more amazing.
Also, please give me some time to gther the statistics. I'm still poking at my tablet in bed an Ive got a place to be in like an hour. If you want to track them down youself for now, you can. Heres an article about chrisianity in China I happen to have open, though:
https://www.washingtonpost.com/world/asia_pacific/christians-in-china-feel-full-force-of-authorities-repression/2015/12/23/7dd0ec5a-a736-11e5-b596-113f59ee069a_story.html