Hey, GreenOracle! Thanks for writing - we're glad you enjoyed helping your first planet!
That is a good question - and honestly, either way works. Our initial idea was to make the choice of Attribute when opposing gods directly be more narratively inclined - to add flavour and context to the action, since they don't contribute to that particular roll. The gods would then always deal damage according to their cards...
That being said, having the damage be tied to the attribute you chose to oppose the god would add another strategic layer to that confrontation and allow you to better manage your health points - which is also cool!
So yeah: original intent was to make gods always deal damage according to their card, having your Attribute act as a narrative device to frame the scene - but taking damage according to your chosen Attribute sounds fun as well, so feel free to play it that way and see how it goes (it should make for a slightly easier game, since it would become easier to avoid defeat - and honestly, the universe could really use Slayers who stick around a little longer)!