Avodah Zarah 64: Not All Non-Jews Are Idolaters

A question is presented before a group of the sages: What is the law regarding the money from a sale of an object of idolatry in the hands of a non-Jew? Similarly, what if a Jew is a creditor for a non-Jew who then sells an object of idolatry and has the funds to pay the Jew back...? The same group receives other questions as well: What about a ger toshav - can he nullify idols? What about when two non-Jews don't share the same idolatrous worship? Would nullifying the worship of the other be effective? Plus, does the Gemara consider all non-Jews, such as a ger toshav, to be idolaters?