Without Churchill, the Axis powers would have won in Europe.
Germany would have invaded Britain and consolidated control of Europe while Italy would have control of North Africa.
Watched the film 'It Happened Here' the other night and it shows a hypothetical situation of England being invaded after Dunkirk. The English would have probably collaborated, despite some resistance.
Europe would have been Fascist and North Africa under European control and the European Empires would not have been abandoned.