In Pathfinder 2, the spell Spiritual Weapon (https://2e.aonprd.com/Spells.aspx?ID=306) has, as a requirement, "you have a deity".
What does it mean exactly? My guesses (from the most to the least likely imho)
You need the "deity" class feature (that you get as a cleric)
You need to be a follower of a specific deity
You need to be the owner of a deity (ok, this one is so unlikely that I only put it here for the joke)