OurCreed
There is no God but Allah
Sorry, but the acceptance of any revelation is based on faith, and on faith alone.
If faith is not a factor in revelation then what you are following is not a religion.
The scriptures are supposed to be a book of revelations, whether it is written by man or it is supposedly written by a deity. (Of course, I don't accept any book was ever written by a god.) And it is faith alone that you accept it is written by God or by a man supposedly speaking for God.
You have a grave misunderstanding. Blind faith =/= faith. Faith means to put your trust into something, to believe in something. Blind faith is to believe in something without any evidence or reason. God knows the state of the human, because He created us. He knows that we humans won't believe in anything without evidence. Which is exactly why God reveals His own signs to those who ask for it. Those who ask for signs will get them. God can easily make any human become a believer, do you think it's hard for Him to do that? He has the power to make every human believe in Him, just like that. But that would ruin the purpose of our existence here.
We're given free will, and not only that, but also a brain, to reason. Something no other creature can do that has evolved on this earth. We humans were created for a different reason, we evolved differently, compared to the rest of the animals. They are here to survive in the world, and they all have their own special characteristics, traits, and abilities to survive in their environments. We humans are created in a state of weakness. The reason we have risen to the top is not because of any of our physical abilities, but because of our brains. This is all intended, we're given this mind to find God, that is why we have reason.
Faith does not equal blind faith. When God reveals His signs to His servants, and does it continuously, a rational person will come to accept the fact that none of these signs and miracles are done by chance, but that there is an actual being that is watching over them and affecting their lives.