Perhaps the best way to understand Asatru is to compare it with the more familiar American Indian spirituality. Both are tribal. Both honor the ancestors, and both have much to teach us about our connection with the natural world around us. Both offer a noble set of values. Most relevant to the point we are trying to make, the Germanic Way and the Way of the American Indian are both native religions - the indigenous religions of specific peoples.
When we see that Asatru is a native religion, it becomes clear that this is not some "pagan" religion we have arbitrarily adopted, nor is it some New Age fantasy, nor is it a whim or passing fad. Asatru has ancient roots - our roots. It is the Spiritual Path of our Germanic ancestors, and as such it deserves to be taken seriously.
Far from being unusual, this connection between ancestry and spirituality is very natural. What is truly strange is to adopt a religion that began in another part of the globe, among people who were not our ancestors!
Asatru honors the Holy Powers - the Gods and Goddesses. It does so using the names by which they were called in ancient times. The Vikings were among the last of the European cultures to be stripped of their ancient beliefs, so followers of Asatru often call the Holy Powers by their Norse names, such as Odin, Thor, Freya, and so forth. This does not mean that modern followers of the Germanic Way dress or act like Vikings, run around in horned helmets, wear bearskins on their shoulders, or pretend that they live a thousand years in the past. Modern-day Asafolk, like modern-day American Indians, drive automobiles, use computers, and dress like ordinary people.
In short, Asatru is not some strange cult, nor something we have taken up casually, nor a historical hobby group. It is a native religion of a large and important part of the Earth's population - the peoples of Europe. As such, it deserves respect just like the religion of the Indian peoples, the African nations, or any other group on Earth
Books in PDF format to read:
Reeves Hall - Asatru In BriefMiac - Asatru And Odinism
Andrew Lang - Myth Ritual And Religion
Anonymous - Asatru And The Paranormal