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Even if you were it would still hold religious connotation, I would assume the reason they point up for a recently dead person is to imply they are in heaven, what else does it mean? so still religious.
They point up because everyone knows what it means, if they pointed to the ground everyone would be confused. It’s really bizarre to classify these gestures as insanity.
Maybe if you put it into Portuguese context it isn’t insanity. If you actually hear the very religious statements these American athletes make, it’s clear that it’s part of insane religious bullshit.