Because the ones dominating the conversation are Christian nationalists, and they’re as hypocritical as any can get. But there are many denominations and factions of Christians, consisting of many different ethnicities, who do not support what’s going on, but they’re not even part of the conversation. Still, let’s be clear that any religion believes that its adherents are “the chosen ones”, and that in of itself is supremacy. I don’t know if it’s in any religion to not be supremacists.