Race is essentially irrelevant. Religion somewhat less so as it reflects people's ethics, although criticizing Jews for their religious beliefs would typically require some degree of criticism towards other Jewish derived religions as well. Namely Christianity and Islam which are both heavily based on Jewish mythology.

They will pursue their interests but their interests are driven by capital rather than any kind of racial grudges. Such grudges are retarded and are used as a means to divide the working class against each other so they won't unite politically against the bourgeoisie.

Immigration is simply another aspect of that. Capital desires cheap labor and by importing large numbers of foreign workers as it erodes the ability of the working class to collectively bargain for better working conditions. And the newly supplanted immigrants tend not to hold the same cultural values as their native neighbors so they are more likely to end up infighting amongst themselves rather than combining their own political and economic interests against the interests of the state and ruling elite.

This is why you see strong pro and anti immigration sentiments being trumpeted from different wings of the ruling elite. The capitalist system loves cheap labor and by importing workers from abroad they can keep costs low. They also can promote racial strife and conflicts amongst the working class with these new immigrants for as many generations as it takes for them to integrate into the new society, which in modern western culture can be practically forever for some groups such as black Americans due to the constant fanning of racial tensions whenever it is convenient for the state to do so.

What color the immigrants are is entirely irrelevant. Their cultural and religious compatibility with the country they are emigrating into is what helps to ensure a speedy and quick integration into the host society.

For example Muslims will not integrate well into Chinese society due to their views on the consumption of alcohol and pork. Which prevents them from engaging in the primary Chinese social activity of eating and inebriating and isolates them preventing integration. Which is one of the reasons why the Chinese are currently in the process of culturally genociding their Muslim residents in outlying provinces. Forcing the integration by destroying the traditional culture.

Also because "there is no god but Allah" is contrary to communist party expectations that loyalty is to the state above all else. But practically speaking the prohibition of alcohol is by far the biggest barrier to social integration which would erode the tendency towards radically violent expressions of their religion.