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your birthday as far as I know does not impact the character, but the guardian does, if/when picking a god/goddess pay attention to the elemental attributes listed under the god/goddesses description. You will notice these numbers differ from each god. Some boost your fire element more while others your water ect. Depending on what your role/job will be some of these gods boost needed attributes more than others.
For example a black mage's primary attack is Flare which is a fire elemental base spell. Choosing a guardian with a higher base fire element will help boost this spells output.
That is just one example but it works the same for all jobs.
I should note though the base number are so minor of a boost, it really doesn't matter what you choose it isn't going to make or break your character in anyway.
Originally posted by Gormogon Those are resistances, not damage bonuses.