IIRC, in 3.5, this problem was solved by a system in which your Deity gives you the choice to be a paladin (whether by a vision, dream, or appearing to you personally), and then you can choose to take up the mantle and receive your god's power. Pathfinder doesn't have that, as long as you're good-hearted and righteous, you can take levels in Paladin.
That being said, the Faiths of Purity book goes over the various Paladin codes of the good deities, with the Faiths of Balance book, Abadar was slated as "the only Neutral deity that supports Paladins." That wording could lead one to believe that evil deities don't tolerate Paladins trying to serve them and immediately seek to either destroy or corrupt such individuals. Or simply don't grant them any divine power until they prove themselves worthy of it, aka, murderdeathkill etc. But that's what we call an AntiPaladin.