Who is Responsible for a Person's Lack of Faith?

WA asked: If Allah SWT decides to grant someone with Faith, then that Someone is the Blessed one. If not, then who is responsible and who suffers for it ?

Answer: Well, the Quran informs us that Allah withholds faith from those who are unwilling to have faith. It says that such people are doing zulm against their own selves, and that Allah is never unjust and never wrongs anyone. Of course, believers in the Quran take such statements on faith, even though we don't really understand exactly what it means. 

I tried to look up if their was some biological basis to Free Will / Free Won't, and this is how I begin to understand it: http://signsandscience.blogspot.com/2014/08/divine-will-and-human-free-will.html