False god
A false god was an apparent deity or other object of worship which was considered to be illegitimate.
In 2268, 892-IV inhabitant Septimus noted that the names of the Jupiter 8, Mars Toothpaste and Neptune Bath Salts were "taken from the names of false gods." (TOS: "Bread and Circuses")
That same year, amnesiac James T. Kirk was seen as a god by Amerind inhabitants for reviving a drowned boy by performing cardiopulmonary and mouth-to-mouth resuscitation. Later, having failed to enter "the Temple" to rouse the temple spirit and stop the storm of wind and thunder, Kirk was seen as a false god by a group of inhabitants who began to throw stones. (TOS: "The Paradise Syndrome")
In 2369, Worf asserted that the Klingon people did not need the clone of Kahless the Unforgettable, whom he referred to as a false god. Koroth suggested that the prophecy about Kahless might have been meant to be fulfilled in that way. (TNG: "Rightful Heir")
The Prophets and the Pah-wraiths were both seen as false godsby some Bajorans, depending on who you asked. (DS9: "Strange Bedfellows", "Covenant")