Science is unlocking the reason.
1. It's in our DNA as an evolutionary trait. It's called pareidolia.
2. Humans look for patterns in nature to fill in the gaps. The less control we have, the more we see a cosmic figure. They did tests about it. Hence more belief among the poor.
3. It's linked with the linguistic part of the brain, in the neocortex. As we evolved it got more complex as an additional structure to our reptilian brain.
Watch through the wormhole with Morgan Freeman. Episode is called: Did we create God or did God create us?