i'm using the term gentile slightly different than yourself. a gentile is a person who doesn't know god for themselves. god for a gentile is something separate from themselves. God for a jew, as jesus explained, is something within self. the kingdom of God comes from within, not exclusively without self, not exclusively apart from self.
this is why a theist who believes god isn't omnipresent in self will never be able to prove god exists. god is some anthropomorphic thing elsewhere for a gentile theist.
just as the following verse explains, the perfect law; which is god is manifested when the gentile does something.
14 (Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law.
obviously they don't understand the Law, or God. God is Love. Love is the perfect Law, the perfect moral. he who has the Law of One, the Law of Love, can do awesome things.