The cross has been the symbol of fascism, nationalism, and ethnocentrism before it was even the symbol of Christianity.
Paintings going as far back as Ancient Egyptian times show the sun cross being used by warring tribes when burning libraries.
The sun cross is also responsible for carrying the blood of millions of Native Americans, non-white immigrants/slaves, as well as pagans and other differing religions.
In contrast, the swastika, having maintained its status as a symbol of balance and divinity for thousands of years, is now considered an evil, pro-Nazi symbol thanks to the actions of one German dictator who used it for mass genocide. We know that the Christian cross has far more blood on it than the swastika, why then is it not considered evil in the same way?
That's because Christianity and white supremacy go hand in hand. It's irrefutable that white supremacy uses the sun cross as their symbol of choice (Look at Stormfront, the KKK, etc). If anybody were to bring up how Christianity is a genocidal mass murdering cult, they would be shunned and persecuted severely for their beliefs.
After reading all this, you simply cannot tell me that we do not live in under white supremacy.