Reading is a complex cognitive process, isn't that amazing.
It is, it is pretty incredible that we are capable of reading and writing.
Yes both, including reading is a great means of language. 
I don't hink we would be able to communicate well without reading.
Reading is how we share ideas and informations.
Exactly, I don't think society would exist.
Yes, reading has a big element of creativity and has an aspect of critical analysis.
Without it we would still be a tribal species probably.