A misconception resulting from incorrect reasoning(noun)
WordNet. Princeton University. 2010.
Use "false belief" in a sentence
"If we live in a Spirit-full Universe instead of a Spiritless Universe, and if many of our greatest problems directly or indirectly stem from our false belief in a Spirit-less Universe, then it seems high time that we reexamine our potentially erroneous belief and do the necessary science to get a clear answer, one way or the other."