Your claim is almost too silly to deal with. A point in time would be good, but this is really for another thread.
I'll give you my view though.
-Without the Brits and the French in 1939, the USSR would have had an invasion much earlier.
-With the Brits making peace with Hitler in June 1940, the USSR would have fallen.
-Without the Brits, the USA would never even have entered the European campaign.
-Without the Americans, most of Europe would probably have fallen to the USSR.
All of those were about decisions that were made, so, - sort of- , turnpoints in the war.