Religion: Christian (denomination unknown)
Name: Black Canary
Alter Ego: Dinah Lance
Other Names: Black Canary II; Dinal Laurel Lance; The Blonde Bombshell; Dinah Laurel Lance-Queen; Dinah Redmond
Super? (Has Super Powers/Special Abilities/Technology): Yes
Number of Appearances: 1,406
Comic Book Appearances: 1,380
TV, Film Appearances: 25
Video Game, Computer Game Appearances: 1
Enemy of: Count Vertigo
In Wonder Woman #34, Black Canary's friend Wonder Woman asked her directly if she is a Christian (to confirm what Wonder Woman already knew). Black Canary answered, "Yeah. I mean, it's complicated, but sure."
(Thanks to Rei Shaw for sending us information about this informative conversation between Black Canary and Wonder Woman, including a link to a scanned image of the actual page.)
Black Canary clearly has a Christian self-identity when it comes to religious affiliation. This probably stems, at least in part, from the Christian religious affiliation of her parents: Richard Drake and the first Black Canary. (Superman himself even read from the Bible at Richard Drake's clearly Christian funeral.)
There is little indication within her large body of published comic book stories, film and television appearances to indicate that Black Canary is an active churchgoer or in any way unusually devout. Her religious affiliation has never been a significant part of her character in the same way (for example) that it is for some of her friends and teammates, such as Wonder Woman, Huntress and Martian Manhunter. But nor are we aware of her exhibiting any indications of particular irreligiosity, unorthodoxy, or deviation from general societal norms for a contemporary American who is at least vaguely or nominally Christian.
Suggested links for further research about this character and the character's religious affiliation: