The accounts of the creation in Genesis repeatedly tell us that each day God viewed the creation and concluded that it was good. Now there are in later passages in the Bible lists of particular animals which were unclean for the Israelites, the flesh of which they were commanded not to eat. People who were ill or deformed were also regarded as unclean. But I don't think, to my knowledge anyway, another race of people is described as unclean. God does not exclude anyone from the kingdom.
Individuals exclude themselves.
And of course this squares with the ministry of Jesus, who spent his life seeking out people and accepting their offerings, to the chagrin of the religious authorities who expected him to accept their ministries alone. So no longer is there any expectations placed upon people. The prodigalness of the Father's love is that all are included. Only those who themselves turn away exclude themselves. The mere fact that individuals desire to enter, means that they have accepted the grace of the Cross, in reality, even if not in so many words.