Scribe
Legend
Everyone has their pet explanation for the difference. Mine is that the relationship is basically reversed. A cleric devotes themself to a god with no expectation of reward, and the god grants favor in return for that piety anyway. A patron offers favor to a warlock with the expectation of service in return, which the Warlock must oblige if they wish to continue receiving that favor, though in many cases they do so unwittingly.
Thats a great one. Especially if Gods literally live or die based on worship, while Patrons are a power unto themselves and dont 'need' worship in the same way.