That other answerer is... getting somewhere, but he makes a lot of assumptions.
Now, we know very little about Scandinavian Norse Paganism. Of course, we have descriptions of the gods and their actions, and celebrations in honour of the gods, but very little on the personal level.
What we do know, however, is that the Norse made prayers when they needed it, to the relevant god. Risky ski trip across dangerous terrain? You might want to give a quick one to Ullr. In dire need of a bountiful fishing catch? Njord. Upcoming battle? Odin, Thor or Ty. Or all three, to be on the safe side. Farmers also sacrificed to Frey and Freya before harvest season.
There were special religious warrior's associations that combined a lot of praying with fighting, but mainly the gods were just invoked when needed. They did affect daily lives through things as funerals and festivals, but compared to the Christians or Muslims of the time, the Vikings weren't that religious. Prayers every day was neither demanded nor necessary.
You see, Norse gods weren't the caring, loving gods we are used to, neither the angry and destructive Old Testament-style gods. Mankind was initially created as an amusement by Odin and his brother, weaker versions of themselves that they could rule over. Mankind was gifted with free will, the gods weren't omnipotent. It was only after it was revealed what would happen on Ragnarok that the gods took action. They needed an army, hence they care for the people to get warriors, i.e. the souls of the dead warriors. So the gods were content with ruling Middle Earth *somewhat*, in order to make life nice for the humans, but they did in no way feel any need to make everything perfect. Hence the invocation when you needed them, only, and the occasional livestock sacrifices to show respect.
What the gods did influence, however, was the warrior culture. The religion glorified battle, and hence helped create a warrior culture.