Ugh. That's such a horribly vague question to ask, because religion is intrinsically bound up with the early medieval world both in terms of politics and everyday life. As with all things C12th, I'd recommend Gillingham's The English in the Twelfth Century as a starting point.

Wulfstan's Sermon of the Wolf to the English may be useful reading, as might any Orderic Vitalis or Gerald of Wales to look at the religious motivations purported to be behind both the Norman Conquest and the Cambro-Norman conquest of Ireland.

Otherwise, look at Books of Hours and their Labours of the Year, to see the ways in which the Church helped keep track of everyday time.management in an agrarian economy.

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