The vikings had a religion called "the old way" as opposite to christianity, witch they called "the new way" . They where polytheists and believed in the following gods. 

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• Odin

God of magic, war, and runes.

• Thor

With his Hamer called Mjolnir, god of warriors.

• Loki

A dangerous half-god half-giant and a big trickster.

• Frigg

The wife of Odin, also the goddess of the home.

• Baldur

The son of Odin and Frigg, a beautiful and gracious god, killed by Loki’s trickery.

• Freya

The goddess of fertility and love.

• Freyr

Freya’s brother, the god of farming, agriculture, fertility and prosperity.

• Njoror

The god of the sea.

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In addition, they worshiped this tree 

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 Yggdrasil the ash tree and the nine worlds;

 

A tree holding the nine worlds; Asgard and Vanaheim for the gods, Midgard (means earth in norse) for the humans, Jotunheim for the giants, Alfheim for the elves, and Svartalfheim for the dwarves. Then, there is the world of ice, Niflheim, the world of fire, Muspelheim, and the last one is the hell, the world of death.