Hmmmm,
I think there is a bit of a misunderstanding here. I have no wish to enter into a religious debate I think you just did but would like to make one attempt to offer some explanation about what some Christians believe, as it might clear up what I believe to be a misconception that BL is blaming God.
Many people believe in a God who is omnicient, omnipotent, and omnipresent. For people who believe in such a God, then it stands to reason that, although he gave us free will and people can choose their own path, he is not powerless against evil. They believe that God
could choose to heal people (and has chosen to do so according to The Bible), and that, yes, he has the power that would enable him to change any event that is happening or will happen.
So, when BL says it is God's will, he isn't saying that God caused this to happen. More that it was God's will to allow it to happen, to permit people their free will to make evil choices, even though those choices resulted in the death of a precious innocent child.
People who blame God are generally very angry with God, and distance themselves from their church. I don't see any evidence that that is the case with BL, so in my opinion he is not blaming God for this tragedy.