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I don't think that's how that works. If you read further, it states specifically:
Manifestation (Su): Upon reaching 20th level, a shaman undergoes a transformation as she manifests as a pinnacle of her main spirit. The nature of this manifestation depends on the shaman's spirit, and is described in the spirit's entry.
So manifestation says that what you get is limited by the Spirit's entry. Just as an example, Battle (literally the first spirit on the list):
Manifestation: Upon reaching 20th level, the shaman becomes a spirit of battle. As a full-round action, she can make a full attack and move up to her speed (either before or after the attacks). Whenever she scores a critical hit, the attack ignores damage reduction. She gains a +4 insight bonus to AC for the purpose of confirming critical hits against her. If she is reduced to fewer than 0 hit points, she does not die until her negative hit point total exceeds double her Constitution score.
Nothing in this indicates to me that they gain the ability to grant spells or become Gods/Major Spirits/Other things capable of granting divine spells.