Faith is something you have hope or belief based on your own experience and from the experience of others. Also by logical thinking.
Blind faith is much stronger, that you hope or believed whatever is happening or will happen even in contrary to your reasoning. A man save up money for his life time work.
Then finally on his old age, he has enough money to start building a small church. Before the church was completely done, the church burns to the ground with faulty electrical wiring.
Why will God alow the church to burn? After all, this is not for the man but to serve and worship God. The man has blind faith: he does not know the reason, but he chooses to believe in the goodness and power of God, and to still worship God.