Truth supervenes on being (TSB) holds that any two worlds that differ in the truth of a proposition differ in what exists. Here's a fun thought: Suppose divine believings are entities, and that they essentially have the property of being divine believings and they essentially have the content they do. Suppose God exists necessarily. Then TSB holds trivially, because any two worlds that differ in the truth of a proposition also differ in what beliefs God has. It's hard to run this argument given divine simplicity, though.