Why do people say it's God when prayers are answered and if it's not then it's a plan?

I am not trying to offend anyone but any time I see a sick/dying person or baby then there will be so many prayers across Facebook. If that person gets better people say it’s because their prayers were answered by God. In situations like this, if the kid did not get better then people just say “It is God’s divine plan, whatever it may be.”

It’s like if it is answered they think prayers work…but if it isn’t answered it’s not because the prayers didn’t work but because God decided otherwise. Therefore didn’t work.