I like to define faith as: the hopes of men, confirmed by belief, and supported by natural reasoning.

The faith of the Vikings isn't really comparable to Christian faith either as Viking worship isn't really how Christians worship or respect and honor God. The Vikings believed that you needed to die a warrior's death to get in Valhalla and that you ought to sacrifice to the Gods every so often, sometimes even with humans! Their faith wasn't the same as ours is, so you can't really say faith is all just the same especially when we have an extremely different view on the matter.

But faith isn't a way to view the world per say as it is a way to look beyond the world. But as Christians, I think it best to look at what the Bible has to say about faith no?

Romans 8:22-24

For we know that the whole creation has been groaning together in the pains of childbirth until now. And not only the creation, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for adoption as sons, the redemption of our bodies. For in this hope we were saved. Now hope that is seen is not hope. For who hopes for what he sees? But if we hope for what we do not see, we wait for it with patience.

Hebrews 11:1-3

Now faith is the assurance of things hoped for, the conviction of things not seen. For by it the people of old received their commendation. By faith we understand that the universe was created by the word of God, so that what is seen was not made out of things that are visible.

Faith is a way of looking not just at the world, but beyond it. And as I mentioned Christian faith is much different from Viking faith so they are not the same consistent idea throughout history.