Think of how good and special it feels to believe that God reached out and saved you personally.

In another circumstance the best doctors in the world, giving it their best effort, might not have been able to save him. As you say, it was a combination of factors, including the boy's resilience, family support, and countless other unidentifiable influences. It is this total collection of circumstances, and influences that is symbolized by the concept of "God". Doctors alone are not almighty, but the totality of reality is. If we didn't already have a simple three letter word to represent that concept we would need to make one up because yelling "oh totality of reality" over and over in the bedroom would just be cumbersome.

Don't blame him, blame the religious system ! Poor lad has been brainwashed since birth !