I'm not sure what you're trying to claim is untrue.

Yes. Race as we understand it today was an invention to differentiate Christian indentured servants, who were often white, from African slaves. As more Africans converted to Christianity, and it was considered immoral to keep Christians as slaves (hence indentured servitude), a new justification was needed to continue to treat Christian African slaves differently.

Thus the invention of white people and black people as opposed to Christians and heathens or Americans and Africans.

The word racism predates the term systemic racism by about 70 years. It was coined somewhere around 1902. But of course, the concept of "racial discrimination" what we would call racism today, was pretty much baked into the concept of race from the start. Black people were considered inferior because that justified their enslavement.

So the people who discriminated on the basis of "race" were really doing so on the basis of skin colour. This is still the case today. Hence my point that it used to be only racists who defined people b the colour of their skin. Again, I'm not sure what you think is untrue,