What are strange gods?

Joshua 24 vs. 23 – Now therefore put away, said he, the strange gods which are among you, and incline your heart unto the LORD God of Israel.

Every god that was manufactured by your hands is a strange god
Every god that can not save, heal, deliver or prosper is a strange god.
Every god that is made from non-living things is a strange god.
Every living thing that calls himself god, but did not create itself and is mortal is a strange god.
Every god different from Jehovah is a strange god.

Prophetic prayer