Your argument makes sense only if you think we are only our bodies. If “God” is a unified field of consciousness, and our true essence lies in that field, it little matters what becomes of bodies. They are only robots, and they are being made faster than they are dying.

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 !