1937 or 1931 make more sense to me
whatever it takes
Very few people–especially religious people–liked the Communist.
After the Molotov-Ribbentrop Pact was signed and made public, perception about Germany and “National Socialism” shifted very quickly. Due to Mussolini’s relationship with The Vatican and apparent support for Hitler, few had little qualms about Fascism–which extended to National Socialism before the summer of 1939; but there was a considerable amount of political pressure about the situation of Christians–especially those converted from Judaism–in Poland.
So the apparent “rapid” escalation of the UK and France entering the fray was actually a huge build up over the proceeding 4 years. The invasion of Poland changed the dynamic that National Socialism then became associated as being “the same” as Communism.
The change in the view of Fascism evolved over the next 3 years as Mussolini actively supported Hitler (note that it was the man, not the Party).
I found the book The Pope at War to be very interesting in seeing a lot of the political and religious dynamics of the late 1930’s through mid-1940’s.