Sentence examples for a dumb ideology from inspiring English sources

The phrase "a dumb ideology" is correct and usable in written English.
It can be used to describe a belief system or set of ideas that you consider to be foolish or lacking in intelligence.
Example: "Many people have criticized the proposal, arguing that it is based on a dumb ideology that fails to address the real issues at hand."
Alternatives: "a misguided belief" or "a foolish doctrine".