There are eight divines to be worshipped, one for each race. I suppose technically you may be able to worship a god that is not your race's patron god, but please come up with a reasonable explanation as to why. Of course, it is also possible that your character is not religious, as the gods did abandon their races in the Great War. Every god has a prebuilt shrine with a chest where you may leave offerings. The gods love generous offerings, and may even reward you for them! The gods and what they represent are as follows.
Shrine of Celestia
Celestia: Goddess of the stars, knowledge, and magic. Matron of - {Avians} Divine Weapon - {Rainbow Rod}
Shrine of Lunalius
Lunalius: God of the moon, shadows, and grace, as well as brother of Celestia. Patron of - {Lunari} Divine Weapon - {Gungnir}
Shrine of Trinitus
Trinitus: God of the wind, commerce and travel. Patron of - {Tellimen} Divine Weapon - {Excalibur}
Shrine of Valmoran
Valmoran: God of the earth, fire, and technology. Patron of - {Vvarden} Divine Weapon - {Megashark}
Shrine of Elysia
Elysia: Goddess of life, art, and love. Matron of - {Arborians} Divine Weapon - {Hallowed Repeater}
Shrine of Carthasis
Carthasis: God of the sea, mystery, and secrets. Patron of - {Aquians} Divine Weapon - {Magical Harp}
Shrine of Shirkal
Shirkal: God of war, death, and chaos. Patron of - {Twa'lek} Divine Weapon - {Light Discs}
Shrine of Thalor
Thalor: God of justice, might, and victory. Patron of - {Norse} Divine Weapon - {Dao of Pow}