You won’t find “racism” mentioned in the Bible. Such language arose far more recently. What you will find though is plenty of mention of “foreigners” and “gentiles” who dwell amongst you and how you should treat them.
For example, in the book of Exodus we are told: “Do not oppress a foreigner; you yourselves know how it feels to be foreigners, because you were foreigners in Egypt.” The are countless passages like this, that command the just treatment of “foreigners”.
So don’t ever tell me that Christian critiques of racism are evidence of Marxist infiltration of the church. No, they’re evidence of Christians paying attention to what the scriptures have to offer on the topic.