Band of Brothers
Christianity is the major religion, but in a very unchurched fashion. The principles of Christianity survived the Fall, but there isn't a church in every small little town. There's a chapel near Millers Crossing, which pretty much the whole town (and local population) goes to for the festivals (see below). No complete Bibles survived the Fall, at least not in this region. The only actual scripture most people have ever heard is some psalms and some passages from John and Genesis, although the gist of the main stories have survived. There are festivals at each equinox and solstice. Christmas for December, Easter for March, the Flood commemorated in June (once the spring rains have stopped), and the harvest at the Feast of the Loaves in September.
Rumor has it that there are people who believe in spirits of the land, but surely that's just the ale speaking.