What you actually *said* was, and I quote, "Sputnik was one of the things that sparked the Cold War into serious being". The word "propaganda" is not actually mentioned in the first, key, clause of your initial contention, so please don't treat me with this smarmy condescending patronising nonsense when you're twisting your own argument to deal with the fact that you're wrong.
It helped cause the Arms Race, true, but it was not a major cause of the Cold War or the renewed tension between America and the USSR in the late '50s and early '60s.
Also, higher Russian combat deaths against a vast enemy coalition is not really indicative of Russian inferiority.