Kivas were used for all of the following except: 1 storage
2 ceremonies
3 a gathering place
4 religion

1. Storage

Explanation:

The kivas some sort of stage made from stone. They're commonly found in ruins from the Hohokam, ancestral Puebloans, and the Mogollon civilization.

Archeologists believe that the structure of Kiva is specifically designed to held public meetings.  The podium is usually located in the center location surrounded by objects that can be used as seats.

Ceremonies, gathering place, and religious practice would be a set of suitable activities held in Kivas. Since it's located on open location, it is extremely unlikely that kivas were used as storage.