Unbelieving a. : Not believing; incredulous; doubting; distrusting; skeptical.

Unbelieving a. : Believing the thing alleged no to be true; disbelieving; especially, believing that Bible is not a divine revelation, or that Christ was not a divine or a supernatural person.

Example:
Why are Republicans so delusional and Unbelieving in facts, history, and science? Is their ideology a religion?

Taxonomy
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Defination from the web:
unbelieving from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "unbelieving" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this ...