Why does God get credit, but not blame?

I’m completely serious, and not trolling. I really hope some religious folks who feel this way can explain why, because I genuinely want to understand. I can’t really wrap my brain around it, and it’s puzzled me for years. Why are many religious people so “one-sided” in attributing things to God?

For just one example among countless, a friend noted on Facebook that a year had passed since her mother had suffered a stroke, and since she herself had been hospitalized for mysterious internal bleeding, and that now they were both okay. One of her other friends commented, “God is good!”

As an agnostic, my natural inclination is to immediately think, “But… if God was really good, wouldn’t he have prevented the stroke and the bleeding from happening in the first place?” Yes, it’s great that they’re better now, but I don’t understand why God gets “credit” for their recovery, but no “blame” for their illnesses.

Or an athlete wins a big championship and thanks God for his talent and helping him win. But the losing athlete never “blames” God for favoring the other guy (even though I’m sure the loser feels like he worked just as hard as the winner, etc.).

Again, I’m TRULY not trying to pick a fight or something. There must be factors I’m not thinking of. Thanks! :-)