What have the Gentiles been doing while Israel has been in dispersion?

During Israel's dispersion, the Gentiles have been resting and feeding on the fatness of the root of Abraham. They have been brought into a place of privilege with an opportunity for salvation based on the promises made to Abraham, though not all are saved.

Les teaches that when God set Israel aside, He brought the whole Gentile world into a place of privilege. Not that all Gentiles are saved, but they now have an opportunity for salvation based on the promises made to Abraham. For the last 1900 and some years, the whole human race as Gentiles has been resting and feeding on the fatness of the root of Abraham while Israel has been out in dispersion. However, Les explains that the day is coming, and he thinks it is getting close, when God will once again shut the door on the Gentile world. He will break them off from that grafted position, and Israel will be brought back in and grafted in again, as Paul says in Romans chapter 11. Then the Gentiles will find themselves again where they were before, without a Messiah and outside the covenant promises.

What has the Gentile world been doing for the last 1900 years while Israel is in dispersion?

For roughly 1,900 years, the Gentile world has been resting and feeding on the fatness of the root of Abraham. They have been brought into a place of privilege and opportunity for salvation, though not all are saved, while Israel remains in dispersion.