I personally define theory as something concrete. A specific idea that I automatically associate with science, and something that needs to be proven or appropriately backed up at the very least.
When I think of an ideology I see it as a person's philosophy on how they view the world or an idea, depending on who they are and what influences their thoughts.
These two concepts can be difficult to define as they are similar, but I distinguish them by believing that a theory is something you learn, and an ideology is created through experience.
The minute we began to talk about ideologies, theories and multiple perspectives, the movie The Holy Mountain popped into my head. The Holy Mountain is a 1973 cult film where a Christlike figure wanders through bizarre, grotesque scenarios filled with religious and sacrilegious imagery. He meets a mystical guide who introduces him to seven wealthy and powerful individuals, each representing a planet in the solar system. These seven, along with the protagonist, the guide and the guide's assistant, divest themselves of their worldly goods and form a group of nine who will seek out the Holy Mountain, in order to displace the gods who live there and become immortal.
If you allow it to, this film can alter your beliefs. It is somewhat disturbing and very thought provoking, and makes you question what reality really is, if it even exists, or if we are a projection of images. Even the way it is filmed is aesthetically pleasing, trippy, and psychologically provoking. It really gets your creative juices flowing and almost forces you to view life through a set of different lenses. This movie is definitely a must see! Let me know what you guys think. :)