Simply, the engergy that you feel within you and around you when you find yourself at peace. The energy that holds the protons, neutrons and electrons in consistant orbit. The energy that keeps the earth in orbit. Also called gravity or magnetism. God is not a person, place or thing. God is pure simplicity. God is so uncomplicated that there are people that make God complicated just so they can grasp the concept. God has nothing to so with organized religion. God is the sound you hear when you listen to your own breathing. God is the energy in yourself that you feel for the first person you think of when you have a power outage. God is the energy within you that you feel towards the person (people) you list as your beneficiary. The intricacy of a snowflake, flower or even your own iris. Or perhaps the pleasance of an unexpected smile. The candle in the window that you know is lit for you. When you feel safe, you are feeling God. No judgments. No fear. No persecution. Unconditional appreciation for your individual life force, no matter how insignificant you think it may be. Everyone defines the word "love" differently, so that is why I have refrained from using that word in this definition.
The movie called "What the *!&# Do We Know?" explains the definition of God better than I ever could.
God, the omniscient, primordial and eternal who created man in his own image and therefore posseses a digestive system, sense organs, limbs and other attributes that would be useless to an immortal being. If God came first, what would he eat or walk upon? Why would he have those five senses if nothing to sense yet existed? And if he has 'always' been here, how long did he sit around doing nothing until he decided to invent the Universe? And why? And if he hadn't yet invented the universe, what exactly was he sitting on? Where is he going to exist if there is nothing to exist in? And what is wrong with the idea that we all just expire and disintegrate and rot?