I learned from Zen Buddhism the same idea that you share here. Indeed, if we treat other people like other act of god, i.e. as things that don't act but just are, a lot of stress, anger, and sadness will vanish [1]. Zen and Stoicism are similar in their promotion of acceptance. I happen to feel more drawn to Zen because of their comprehensive guide towards how to achieve this acceptance.

[1] Within Zen, this idea is captured in the parable of an "empty boat." http://omswami.com/2015/09/the-empty-boat.html