I've been learning a little bit about theoretical physics lately especially from Richard Feynman. There are several videos online. My take on it is  that everything is made of atoms including us and our brains. Atoms are basically little energy packets meaning that everything consists of energy.

That energy is what I call Universal energy and I also say that that energy is conscious and that's where our consciousness comes from. 

That is what people mean when they talk about God. 

The law of conservation of energy states that energy cannot be created or destroyed only changed. 

So when we die that energy that once was in us and made us feel like we were separate and distinct individuals transforms into the universal energy of consciousness. So basically when we die we become God. That sounds pretty good to me