How many actual Gods are there in mythologies?

There are more Gods and Goddesses both minor and major than leaves on a tree. As to a specific deity having the attributes you specified, only in the Abrahamic religions does one with all of these exist. In other religions the world everything was created by many, and they did die physically, but their spirits remain to guide and help their children. In other words all living things. As for humans elevated to God status, they are called Demi-Gods, and to become one the person being elevated must have done something worthy of the status.