Israelites (Judaism) which was the foundation for Christianity
By the given statement in question, Truman wanted to imply that the effect of communism was growing and if it could not be checked by aiding such countries as Greece and Turkey, then it would have far reaching effects. Truman feared that communism would slowly grip these countries in financial trouble and spread to the Latin American countries and the countries in the East at a very fast rate.
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The breakdown of the wartime alliance between the U.S. and the Soviet Union, then the responsible party for starting the Cold War would be the Soviet Union, because of the Soviet Union's wartime espionage program against the United States.