Have you ever read the Stand by Stephen King? It is one of my favorite books. I love books about events concerning the end of humanity as we knot it.
yes I love books about humanity having to survive
Well what were your tboughts on the Stand? Did you find it too long? Too descriptive?
i loved it.  it was long but the author makes it simple to read
Do you think something like that could happen today? Something like the Rapture?
many books reference a rapture so its not out of the question.  What about humanity's reaction?
That is easy. Humans would freak. It would be the collapse of civilization as we know it. I think it would be somewhat like the Stand. 
i agree the world would be in chaos.
Another good book about the end of the world is the ORyx and the Crake by Margaret Atwood. Are you familiar with it?
I 'v not heard of those.  What settings are those books?