The Crusades are usually framed as religious wars. On one side were Christians, on the other were Muslims.
But they were also split by race. The Crusaders were predominantly western/central European while the counter-Crusaders were Arabic and Turkish.
To what extent was racism a driving force of those conflicts? Was it ever on par with religion or at times did it overshadow it?
u/ThimasFR answered a similar question a few weeks ago:
Did the European idea of race have its origins in the crusades?
I've also written about how the crusaders and Muslims viewed each other and their "races":
I'm a Crusader heading towards the Holy Land in 1096. How much do I understand about Islam?
What stereotypes or preconceptions did the Arab world hold about Europeans during the Medieval era?
But as ThimasFR says, our modern conception of "race" and racism is, well, modern. Since races don't actually exist and are 100% a cultural/social construct, it's impossible to extrapolate racial divisions very far back into the past. Even today there are lots of different conceptions of races, which don't really map very well with each other - so I'm assuming you're talking about white, western European/Anglosphere concepts of race, but that's not the only option.
Medieval crusaders did have a concept of "us" and "them" but it was based on religion, not on anything that resembled our modern ideas of race. If an Arab, Turkic, Ethiopian, Mongol, or any other kind of person converted to Christianity, they were now on Team Christian, and their "race" didn't matter.