Not quite. In the Old Testament, see, for example:
Genesis 18:18: "Abraham will surely become a great and powerful nation, and all nations on earth will be blessed through him."
Isaiah 49:6: "... I will also make you a light for the Gentiles, that you may bring my salvation to the ends of the earth."
Jonah 4:10-11: "But the LORD said, 'You have been concerned about this vine, though you did not tend it or make it grow. It sprang up overnight and died overnight. But Nineveh has more than a hundred and twenty thousand people who cannot tell their right hand from their left, and many cattle as well. Should I not be concerned about that great city?'"
Sorry you're right Radagast I should have qualified my language slightly as obviously there are passages that point to the inclusion of the gentiles, particularly in Isaiah when he talks of the coming of the Messiah. However, while I happen to agree with you with regards to the New Testament, I also feel that there are a number of other passages that are worthy of attention when considering this issue.
Firstly obviously I think anyone would be hard pressed to form a convincing argument that the Israelites were not Gods chosen people, for whatever purpose they were/are to serve. The first covenant between Abraham and God was to be signified through circumcision. From this perspective one passage from Ezekiel (31:18) that I found interesting is yet shalt thou be brought down with the trees of Eden unto the nether parts of the earth: thou shalt lie in the midst of the uncircumcised with them that be slain by the sword. Here it seems to quite definitely suggest that the uncircumcised are headed to hell. If anyone can offer an alternative interpretation however Id be very open to hearing it.
Another passage that seemed to suggest to me the deliberate exclusion of other nations is this: Nehemiah 13:1-2: The Ammonite and the Moabite should not come into the congregation of God forever because they met not the children of Israel with bread and water but hired Balaam against them that he should curse them. Perhaps there is a genuine call for judgement against the original offenders but to keep them out forever?
Also in Isaiah 48:11 when Israel is being chastised for their sins but reassured about their future it says: For mine own sake, even for mine own sake, will I do it for how should my name be polluted? And I will not give my glory away unto another. Perhaps it is just the translation but it sounds to me that the idea of bestowing his glory on another nation is not something that God considers appropriate.
Deuteronomy 20:15-18: Thus shalt thou do unto all the cities which are very far off from thee, which are not of the cities of these nations. But of the cities of these people, which the LORD thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth: But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the LORD thy God hath commanded thee: That they teach you not to do after all their abominations, which they have done unto their gods; so should ye sin against the LORD your God.
Now obviously the there is a clear argument here for saying that God needed to destroy these nations in order to make sure that His people werent contaminated with their spiritual practices. However this act seems incongruous with a divinity who not only loves all his creations but want them to embrace him as the one true God. Given these nations have most likely never heard of the God of the Israelites what opportunity are they given to repent for their sins? This seems to me to be an example of God working exclusively for the Israelites rather than for the good of all mankind. In fact in Joshua 23:3 it says And ye have seen all that the LORD your God hath done unto all these nations because of you; for the LORD your God is he that hath fought for you, again suggesting that the annihilation of the nations was for the sole purpose of Israel. Now Im sure that you could argue that ultimately for the benefit for mankind but, going back to my original question, Im still not sure what the purpose was so everyone please feel free to elaborate.