You're misunderstanding the entire point of Christianity, in the interest, perhaps, of a snarky quote? In Christianity, the world will always be fallen, sure. The whole point is that it is. The non-fallen place is heaven- that's where "our diety" is: bringing those who'd actually want to be there to Heaven. What we do in the meantime is try to make the world as less-bad as possible.
For the world being fallen:
"Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned." (Romans 5:12)
"Cursed is the ground because of you; in toil you shall eat of it all the days of your life; thorns and thistles it shall bring forth for you; and you shall eat the plants of the field. By the sweat of your face you shall eat bread until you return to the ground..." (Genesis 3:17b-19a)
Our mission on Earth:
https://bible.knowing-jesus.com/topics/Charity
Note that most of these quotes are very often used (and quotes here) in such a way that it wouldn't even be sustainable to survive and continue giving. You have to use your brain, even with Biblical commands, in order to carry them out it seems.
Take note here that I don't even think any of this is necessarily moral or a good idea. But it's easy to find!