RAF fighter command started with less machines and pilots . BUT because the RAF were fighting over their own land a lost plane would not always mean a lost pilot . where as the Germans would lose a plane and machine every time as either POW or KIA.
At the start of the BoB bomber command took up roughly 70% of new aircrews as BoB went on pilot training was more focused on fighters . hence why at the end of BoB fighter levels were about the same . Also note that RAF fighter command also includes squadrons out side of mainland GB at the time . most important figures to look at are squadron strength in 11 and 12 group for the RAF . Aircraft production was done in double shift . In Coventry the BSA works never stopped production from 1939 to 1944 . BSA made browning 303 and ammo , bren guns, 76mm shells , vickers guns and ammo. The only time production stopped was for 12 hours after the main factory was bombed and the lower levels were made safe for work .
RAF tactics improved over the course of BoB too . after the first 4 weeks Squadron leaders threw out the old book and changed to a finger four like the Germans . They also designated targets for each squadron dependant on aircraft. Pilot rotation became more common thus cancelling out combat fatigue which plagued the lufft . While individual pilot skills were higher at the start this advantage was soon lost quickly . As i pointed out before the RAF could hold on to this skill set easier than the Germans .
As to if anyone was prepared to defend against germany then i think even the USA wouldn't have been able to stop the Germans if they had been attached to main land Europe. That is what saved Britain. The English channel with out it The UK would have been lost . RAF bomber command was ill prepared to attack armour , the army would have been ineffective against German armour. German war tactics need short fast battles to win . That is what made the Bf109 a terrible escort too short rang for the job .
If Germany had been in Britain's position then the result would have been very similar with 109's defending against Hurricanes , spitfires escorting Wellington and Hampton bombers. In fact if they had kept the air forces the same size then Germany may even have been able to break out into Europe and push back the aggressors
