Both are fantasy and have the same fictional creatures
Both Chronicles of Narnia: Prince Caspian and Eragon are young adult fantasy novels, but the similarities end there. The Chronicles of Narnia series focuses on the adventures of children in a magical land, while Eragon follows the journey of a young dragon rider in a medieval-inspired world. So, while they both fall under the fantasy genre, the themes, settings, and styles are quite different.
Prince Caspian is portrayed as a brave and honorable character in C.S. Lewis's "Chronicles of Narnia" series. He is depicted as a natural leader who is determined to reclaim the throne of Narnia from his evil uncle, King Miraz, and restore peace to the land. Caspian is also compassionate, kind-hearted, and willing to listen to the advice of others.
"Eragon" is told in third person limited, primarily following the perspective of the main character, Eragon. The narrative provides insight into Eragon's thoughts, feelings, and experiences, offering a more subjective view compared to third person omniscient.
Eragon
Ed Speleers played Eragon in the movie.
In Eragon the dragon is called Saphira and her rider is Eragon
You may enjoy other fantasy series such as "The Inheritance Cycle" by Christopher Paolini, "The Lord of the Rings" by J.R.R. Tolkien, "The Chronicles of Narnia" by C.S. Lewis, or "The Wheel of Time" by Robert Jordan.
Eragon does not have a religion.
Ed Speleers played the character of Eragon in the movie adaptation of the book "Eragon."
Characters: Eragon, Roran (Eragon's cousin), Arya (elf who got the egg to Eragon) Saphira (Eragon's dragon) Brom (storyteller/dragon rider/Eragon's dad), and galbatorix (main antagonist).
Eragon
Book one in the Inheritance Series is called Eragon. The only known riders in Eragon are Galbatorix and Eragon himself, though at the end of Brom's life Eragon learns that he too was once a rider.
Eragon was written by Christopher Paolini.