Gods were invented to explain the unexplainable, what causes lightening for example, as primitive man evolved into more sophisticated societies so did their gods and a section of the population became the mouthpieces of those gods.

Many civilisations believed in a pantheon of gods, Greek, Roman and the Norse gods for example, even the Australian Aborigines who had Baiame, his wife and sons.

The god of Abraham, Yahweh adopted by the Israelites originally came from the pantheon of Canaanite gods, Baal, Anat etc.

You could say that man made gods in his own image and gave them some sort of superpower since whole families of gods were invented.

There is no good reason to believe in the god now referred to simply as God than there is to believe in Odin, Zeus, Apollo or Vishnu, all have equal validity if any one of them has any at all.

As mankind learns more about the natural world, the space left for gods gets smaller and smaller, eventually apart from some diehards, it will disappear altogether.