In "Can't Wait to Get to Heaven," Fannie Flagg explores profound themes of faith and doubt. The quote by Alfred Lord Tennyson, "There Lives More Faith in Honest Doubt, Believe Me, Than Half the Creeds," highlights the importance of questioning beliefs and the strength that can be found in doubt. This perspective suggests that genuine inquiry can foster a deeper understanding of one’s faith, rather than simply adhering to established doctrines.

Flagg's narrative reflects this sentiment, portraying characters who confront their beliefs and uncertainties. Their journeys illustrate that embracing doubt can lead to personal growth and a more authentic connection to spirituality, enriching their lives and perspectives. This powerful message encourages readers to value the courage it takes to question and seek meaning beyond conventional beliefs.