
Just a Guess |

The believer's boon feat allows you to use all 1st level domain powers of one cleric domain once per day. It has no duration listed.
Some domains grant a familiar.
Can you use your one use per day of that domain to gain a familiar (with level 1 powers) all day long?
Prerequisite(s): Wis 13, alignment must be within one step of your deity's.
Benefit: Choose one domain granted by your deity. Once per day, you can use all 1st-level domain abilities granted to clerics of that domain. You gain access to this one ability only, not the higher-level domain ability, domain spells, or additional class skills that the domain might grant, or any bonus feats that are listed under its granted powers. Your effective cleric level in regard to this ability is 1st level.
Special: You can take this feat twice. When you take it a second time, you choose another domain granted by your deity.
If you grossly violate the code of conduct required by your deity, your alignment shifts so that it is more than one step away from your deity's, or you no longer worship your deity, you lose access to this feat. You can regain it once you atone for your misdeeds to your deity (see the atonement spell).
If the domain grants a second power at first level, could you use both once per day or would it be once per day that you could use both?
Familiar: You gain a viper familiar. Your effective wizard level for this ability is equal to your druid level. Your druid level stacks with levels from other classes that grant familiars when determining the powers of your familiar.
Slither (Ex): As a free action, you can distend and stretch your body to fit easily through narrow spaces for 1 round. You can move freely through a tight space that would normally require a creature of your size to squeeze through. While slithering, you gain a +2 dodge bonus to Armor Class against attacks of opportunity provoked by your movement and a +2 bonus on CMB and on Escape Artist checks made to escape from a grapple. You can use this ability a number of times per day equal to 3 + your Wisdom modifier.

Just a Guess |

You get Slither not Familiar with this ability.
Why?
Once per day, you can use all 1st-level domain abilities granted to clerics of that domain.
Which part of the ability tells you that you do not get the familiar?
For me its just that it sounds too good to be true but that alone is no reason that it does not work.

Hogeyhead |

The first level power is slither, the familiar is a bonus from the domain, think of it like a 0th level power. It is in the text of the domain not it's first level power. If you took travel you would not get the 10 feet bonus to movement either. If you took trickery you would not get bonus class skills.

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The first level power is slither, the familiar is a bonus from the domain, think of it like a 0th level power. It is in the text of the domain not it's first level power. If you took travel you would not get the 10 feet bonus to movement either. If you took trickery you would not get bonus class skills.
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