Answer:
to support his claims that communist and non-communist states cannot exist in peace
Step-by-step explanation:
McCarthy claimed that communism's greatest flaw was that its only religion was immorality (or Immoralism as he called it). He quoted Stalin to emphasize the fact that communism repudiates Christianity and that communist values oppose Christian values. Communists cannot live in peace with Christians and will not accept Christian democracy, and they will fight against them to impose their communist doctrine.
He also claimed that the greatest threat to America wouldn't come from actions of communists abroad, instead, it would come from traitors within the nation.