Final answer:
The specific claim about Bishop Zumárraga destroying 400,000 manuscripts is not supported by historical records, but it is true that the Spaniards destroyed many Indigenous documents, including those during Bishop Diego de Landa's book burnings.
Step-by-step explanation:
The claim that Spanish Bishop Zumárraga participated in destroying 400,000 manuscripts of Mexico's Indian religio-philosophical beliefs and "ways of life" does not appear accurate. It is well-documented that mass destruction of Indigenous manuscripts occurred in the Spanish conquest of Mesoamerica, especially during the infamous book burnings by Bishop Diego de Landa in 1562. However, the figure of 400,000 and the involvement of Bishop Zumárraga specifically are not substantiated by historical records. The Spanish, including clergy like Dominican friar Bartolomé de las Casas, did attempt to document Indigenous cultures despite their efforts in conversion, resulting in post-conquest manuscripts incorporating European influences.
It is true that the Spaniards destroyed a vast number of Indigenous documents which they viewed as pagan. This destruction is a tragic loss, as it led to the eradication of much of the pre-Hispanic culture and knowledge. Following the conquest, new manuscripts were produced that show the melding of Indigenous and European traditions, sometimes attempting to document what had been lost. The Spanish, in addition to noting human sacrifices by Indigenous groups, may have exaggerated accounts to justify their own actions.