[quote=@Kho]
<Snipped quote by Vec>

You say that, but what happens where two gods of more or less equal power swear by Amul? It's not like they could exactly force anything out of the other without potentially procuring serious damage, and so lying may be better.
And it's always better to enter deals with creatures, even if they're weaker than you, for the sake of keeping up a good public image - otherwise, the other gods might get annoyed and decide to give you what's for. The equivalent of CKII's tyranny or EUIV's aggressive expansion >.> so lying there may be good for the sake of getting what you want by more cunning means while preserving a good image
[/quote]

The thing is, it all comes down to the question you asked earlier - will Amul enforce those oaths? If yes, then swearing in his name is practically signing a contract, and if you don't abide by it, you will get punished accordingly. If no, then I don't even know why we are having this discussion.