Now, it's not the reason I'm an atheist, but "getting from the blue one to the grey one" (and hearing nothing) is so big that to me it disproves at the very least the existence of a personal god.
You may think it ridiculous, but I'm trying to convey why some people would think that it does change their life.
Most world events don't change 99.99% of people's lives, and yet they matter too. The only big world event, maybe in my entire life, that affected my life was covid. Because I lived in a lockdown country.