That's really cool. Norse mythology is very interesting to me, and I like learning about Norse religion(pre-Christianisation of Scandinavia, as well as Ásatrú which is the 'modern' version)
My guess is that he practises Ásatrú; an independent faith. Its tenets are belief in the Æsir and Vanir; the exchange of gifts with the Gods and one's kinfolk, and living one's life in accordance with Nine Virtues of Asatru. The Havamal, also referred to as "The Words of Odin", has several translations, and are words of wisdom, to help guide one in their daily life. Asatru has no ties to any Judeo-Christian religion, nor is it a part of any New Age or "neo-Pagan" belief system, including Wicca.
They believe that in the beginning, the world was a bipolar one, with ice in the North and fire in the South separated by a deep chasm. At the beginning of that which can be known, fire and ice came crashing together in a primal collision of indescribable violence; this cataclysm, however, produced at its heart a warm, mild region, touched with moisture and sweet air and fit for life to emerge. The Æsir and Vanir themselves arose within this primal womb. The race of Men was created by the God Odin and his brothers, who breathed life into dead wood and made the first man and woman. The world of Men, Midgard, and the world of the Gods, Asgard, are two of nine Worlds created by Odin and his brothers. All these lie within the sheltering branches of Yggdrasil, the World Tree, uncreated and eternal, the pillar and axis of all that is.
Asatru is practised by living one's life in accordance with the Nine Virtues. They also hold rituals and ceremonies in which Asatru folk interact with the Gods and Goddesses. The foremost spiritual practice is the exchange of gifts between Gods and men. In ancient Teutonic societies, peace and trust were secured between individuals and tribes through the exchange of things of value. This was reflected in religious practice; therefore, the main rite of modern Asatru is the blot (pronounced bloat), or offering. In Gladsheim, when we gather for a blot, we use a drinking-horn filled with mead, beer or wine, and, raising it, address one or more of the Gods. They may speak a toast to Them, or to a personal hero or ancestor; or make a vow, or report the fulfillment of a vow. Words thus spoken are made holy by the presence of the God or Goddess, to whom the drink is offered. When the offerer has spoken, he also drinks from the horn before passing it on; usually a blot consists of an opening invocation followed by three rounds of toasts. At the end, that part of the drink that is not consumed is poured out upon the Earth.