I must disagree. People "believe" based on some form of input, whether it be from other people or another source. So their choice to "believe" has basis in something, therefore it is not totally blind.
Available information includes your own existence in this reality of life and the perspectives you gain within it.
I never said all faith revolves around analytical evaluations. Some choose to "believe" based on little information or unreliable resources. Regardless of that fact, it still goes back to my first note in this comment.