According to Osho, whether “nothing happens through our doing” is factually true is unimportant; its value lies as a meditative device. Like fate, non-doership functions to end questioning and personal will, relaxing the mind into surrender. When you adopt it totally, obstacles to samadhi fall away. Treat it as skillful means, not metaphysics.
Don’t worry if it’s literally true; using the idea that you’re not the doer helps you relax, stop questioning, and become quiet inside.