God is one

Yes their is one God and we are all his creation...Their are differences because when evil comes in it tries to take what is Gods and change it. So no not everyone is following God..Some follow evil, that is why we have all the problems.

Fifty shades of God. You're right though, humans fight against each other for their God although they share the same one. However it's like a child goes to live in the mountains and workss as a shepherd, another one goes to the seaside and works as a fisherman. All children will be different if they grow up in different parts of the Earth, but our strenght is in our difference: the fisherman needs wool while the shepherd needs fish.