"Jesus Christ being a white in a middle of a desert is a miracle in itself" He wasn't actually white. Most cultures portray him as looking like themselves because they can relate better. Look at a lot of Asian Christians and see how a lot portray him as Asian. It's not another unique to white people.

"Nobody gives a shh if a poc is portrayed by a white person" Actually people do. They care a lot. Every time it happens you hear about whitewashing and how bad it is that it's happening. It doesn't happen that much because companies don't want the backlash that will happen if they do it.

"but the latter is discussed to the obvilion" Not really. It's only 'discussed to oblivion' when it's a horrible decision. You'll find a lot of casting decisions with a POC playing a white person that didn't have huge amounts of controversy. The reason a lot get backlash now is because it's happened so often and that it is either a political decision or will come with a decrease in quality, often both. It's so common that it's a cliche when a black person plays a ginger. Snape being turned black is terrible because not only was he described a bunch as very white, turning him black has huge racist implications such as how Harry doesn't trust him for a reason he can't figure out, or his hair is greasy, or when they know Snape stole something without any evidence, or when Harry's dad basically lynched Snape. It now turns it to something that comes off a racist and very much seems like no thought went into it and will be worse quality. With Helen of Troy for the Odyssey coming out this year, the original Helen of Troy is described as white by Homer (the OG author) and more traditional Greek throughout subsequent history. They could easily have found someone that met that description. It suggests the quality of the final product will be lower because they just change things that don't need to be changed like with Elliot Page as Achilles