"All servants who were ‘Negroes, Moors, Mollattoes or Indians’ were to be considered slaves at the time of their purchase if neither their parents nor country were Christian (Virginia)" (Slave Codes)...

"All servants who were ‘Negroes, Moors, Mollattoes or Indians’ were to be considered slaves at the time of their purchase if neither their parents nor country were Christian (Virginia)" (Slave Codes)

Question:
Based on this quote, how did racism justify slavery?