How we cite our quotes:
"That is a story invented by the Telmarines. Your Kings are in deadly fear of the sea because they can never quite forget that in all stories Aslan comes from over the sea." (4.73)
In Prince Caspian, Aslan represents Jesus Christ, and in the world of Narnia, there is no question that his religion is the true and righteous one. Don't agree? You'd definitely be reading against the grain.
"Do you believe all those old stories?" asked Trumpkin.
"I tell you, we don't change, we beasts," said Trufflehunter. "We don't forget. I believe in the High King Peter and the rest that reigned at Cair Paravel, as firmly as I believe in Aslan himself." (5.67-68)
Trumpkin is to Prince Caspian as Edmund was to The Lion. Both characters start as skeptics and eventually come to believe in Aslan. To be fair though, Trumpkin had it way easier than Edmund did (though Edmund himself might be partly to blame for that).
"And if I hadn't believed in [Aslan] before, I would now. Back there among the Humans the people who laughed at Aslan would have laughed at stories about Talking Beasts and Dwarfs. Sometimes I did wonder if there really was such a person as Aslan: but then sometimes I wondered if there were really people like you. Yet there you are." (5.70)
Caspian's faith grows by the sight of talking animals. As in real life, faith and religion go hand-in-hand in the novel. You can't have one without the other.