How do you know you're communicating with God?

How do you know that your connection to God, your personal relationship, isn't just a conversation in your brain? Write your own personal explanation using between 5 - 500 words and the author who's response helps me better understand this phenomenon will receive one ticket to the 2015 Wild Goose Festival. ( I purchaed the ticket hoping to attend but I won't be able to make it, maybe next year). Email me at treybien33@yahoo.com by June 18th, 2015. Background: on the continuum I sway between a reluctant athiest and a skeptical agnostic. I'm pretty far from the "true believer" end of the spectrum. But, I keep an open mind. Personally, I can't sense any reality beyond the natural world. So, I'm interested to understand how/why people of faith know their personal relationship with a supernatural being exists as opposed to it just being a dialogue in their mind/brain.

Didn't know it, but looks like I'm an Epicurean

Epicureanism is a system of philosophy based upon the teachings of the ancient Greek philosopher Epicurus, founded around 307 BCE. Epicurus was an atomic materialist, following in the steps of Democritus. His materialism led him to a general attack on superstition and divine intervention. Following Aristippus—about whom very little is known—Epicurus believed that what he called "pleasure" is the greatest good, but the way to attain such pleasure is to live modestly and to gain knowledge of the workings of the world and the limits of one's desires.