It's also worth noting that the Nazi Germany didn't enact a total war economy until 1943. While the US, USSR, UK all went to a total war economy from the moment hostilities started for each of them, the Nazi's delayed it until the war was just short of 4 years old for them. Any new weapons systems is going to be slowed as a result. Semi-auto rifles, aircraft carriers, wonder weapons...all of that would be slower to put into service as a result.
Even if they had developed an atomic bomb...nothing that would even approach being an effective delivery system.
"And remember, Abraham Lincoln didn't die in vain, he died in Washington D.C." - Firesign Theatre