FAITH
When exactly does the faith token get spent?
When resolving the effect, this effect is not voluntarily triggered.
If a unit no longer has a Faith ability, does it lose any Faith tokens?
No, you don't lose faith tokens. For example, if a unit loses its abilities, or a faith attachment is removed from the unit, any faith tokens remain on that unit.
Can units without Faith abilities have faith tokens?
Yes. But faith tokens cannot be spent as long as that unit does not have a faith ability.
If my army includes Beric Dondarrion - Azor Ahai (Faith Attachment) and Edric Dayne - Loyal Squire, when do those units gain Faith tokens?
Beric's unit gains a faith token when it passes a Morale Test. Edric's unit gains a faith token when it passes a Morale Test. Note that the exact wording is "Each time Beric's unit passes a Morale Test, it gains 1 Faith token.", where "it" refers to the unit passing the Morale Test. Edric's unit counts as Beric's unit through the ability "Beric's Vassal".
FOLLOW-UP: Can Edric's unit gain Faith tokens, even if it does not have any Faith ability?
Yes.
If a single unit has multiple Faith abilities, how many tokens does it gain when it passes a Morale Test?
It gains 1 token for each ability. Remember that a unit can't have more than 1 ability with the same name.
FOLLOW-UP: If my army includes Beric (Faith attachment), a unit of R'hllor Faithful with Thoros (Commander) and Edric, and that unit passes a Morale Test, how many Faith tokens does it gain?
If a unit has multiple Faith abilities, with how many Faith tokens does it start the game?
A unit only ever begins the game with 1 Faith token.