For the thirteenth century, the best sources we have to answer this kind of question are the sagas, and based on those stories, the best answer is, "It's complicated." Many of the sagas are set in either pre-Christian or recently-Christianized Scandinavia, and at least one, Óláfs saga Tryggvasonar, is primarily concerned with the process of conversion. These sagas don't show any unanimous view of pre-Christian Scandinavians or, for that matter, Christian Scandinavians. I don't think any of them can be said to portray the pre-Christian (or non-Christian) Scandinavians as "just . . . pagan barbarians," though. The non-Christian characters have both admirable and execrable qualities. Pagan religious and magical practices are depicted as regrettable and wrong-headed, but so are a lot of practices of "bad Christians" who were either poorly instructed or just didn't fully internalize Christian teachings. The sagas envision possibilities like it being OK for a Christian to attend a pagan divination ceremony if good manners and the demands of hospitality seemed to require it but also of Christians wrongly burying their dead in unconsecrated ground, apparently out of habit, instead of the churchyard, incidents that both occur in Eiriks saga. Thomas du Bois argues that the Óláfs saga Tryggvasonar disapproves more of people who convert to Christianity for purely political reasons than of those who, out of genuine conviction, remain pagan. Certainly, a saga like Víga-Glúms saga portrays pre-Christian Scandinavian society as fatally flawed, locked by pride and the imperative for vengeance into a cycle of violence that only Christianity could end. Whether or not one concurs with its author, the point is that it's portrayed as a cultural flaw, not an individual one.

Sources:

Thomas A. DuBois, Nordic Religions in the Viking Age (Philadelphia: University of Pennsylvania Press, 1999)

Snorri Sturluson, Heimskringla trans. Lee Hollander (Austin, Tex.: University of Texas Press, 1991)

Jane Smiley, ed. The Sagas of the Icelanders (New York: Viking, 2000)