Muslims, Buddhists and tribal people and even non religious people have superstitions of some kind.
Sorry that's not true. The issue is there are no absolutes, there are many different types of interpretations of atheism, and as a Buddhist, I have an issue with you saying this, as there are people who follow the philosophically aspect without any theism. The tenets of Buddhism do not rely on the supernatural at all. People can follow a path for peace of mind and fulfillment, has nothing to do with the supernatural realm, whatsoever. Zazen is the core of Zen Buddhism and that is meditation.
I don't know much about tribal people, but I know that there are many facets to it, and we can't say for sure what they think or believe.