[piusv]

Secondarily, to use the quotation to justify the requirement all Christians be Roman Catholic, is out of context.

How is it out of context? This quote is still true and accurate.

[SpirituTuo]

Because the context was the Council and the return of the Armenians, Greeks, and Copts to unity with Rome. It was not a general statement about non-Christians.

Additionally, other, more recent and specific statements have been made regarding schismatics and non-Christians which are more relevant and directly applicable.