Christianity

Christianity was the intended religion of the Legend of Zelda series prior to the creation of the Golden Goddesses. Although the religion's existence is very vague, it is implied throughout the early installments of the series.

The Legend of Zelda
The Book of Magic resembles a stereotypical depiction of the Bible as it has a cross on its cover.

Zelda II: The Adventure of Link
The Cross is an obtainable item that is used to make invisible objects visible.

The Legend of Zelda: A Link to the Past
Although this game rang in the religion of the Golden Goddesses and the Triforce, official artwork was released regardless that depicted Link kneeling before a crucifix.