Racist/Racism - Do we use these words in wrong situations?

[Bursche]

There are different races of humans because of the varying pigments in our skin and other attributes. Much like other animals who have varying characteristics that alter themselves from each other in different species.

Discrimination of religion is not racism, it is just discrimination. I do not see many people being associated with racism if they are discriminating because of religion.

We do have different races so racism does exist. Nationality racism is tricky because it can be associated with race.