Oh please.
The Germans had lost the war long before 1944, much less 1945.
By D-Day (June 6, 1944), the Germans could only muster 180 fighter aircraft and 198 bombers against the entire allied invasion (which was covered by over 5,000 U.S. and British fighters and bombers).
This mismatch in the skies permitted the 6 invading allied army divisions to smash through the more than 40 German Army Wehrmacht divisions that were deployed to repel any invasion against the Constinent.
The first launch of the German V-1 cruise missile was made that month in response to the D-Day invasion (because the Germans had no other way to reach London by that point).
The first American test flight of the JB-2 "Loon" cruise missile was made in October of that same year (though this secret project was kept in the dark so as not to have to share the technology with the Soviets - and later reported as not having taken place until 1946).
Regardless, the German industry was incapable of producing enough fighters to counter the routine 1,000 bomber allied raids over Germany. Had German industry been up to that task (an impossibility - worse, they didn't have fuel for the few fighters that they did manage to cobble together), then the first nuke would have been placed on a minisub and towed into a Nazi harbor.
By late August of 1945, the U.S. was producing 7 atomic bombs per month.
Had the Germans held out any longer than they did, most of central Europe would still be radioactive to this very day.
The war was never in question. The combined might of Germany and Japan could not match even half of the economic might and industrial output of the U.S.
That's death for any war of attrition.
40 defending army divisions getting whipped by 6 (yes, just six) invading army divisions at Normandy pretty well spells out the fighting ability of the two sides, too.
The Russians lost millions of men, the Germans lost millions of men, and the Japanese lost millions of men. On the other hand, the U.S. lost only 385,000. That's a heck of a statistic when you consider that it was the U.S. that got hit by the major surprise attack.
By 1945, the U.S. was producing half of the entire planet's gross domestic product (GDP).
No enemy of America had an effective way to inflict serious damage on America's homeland, either.
WW2 wasn't a war so much as it was national suicide on the part of Germany and Japan (though it turned out pretty well for them when you consider how well we re-wrote their governments for them and how much aid we sent to them after they surrendered).
But the war's outcome would not have been changed if the Soviets had been forced to sue for peace. That trick didn't even work for the Germans in the FIRST world war when the sides were more closely matched, and it certainly wouldn't have worked in 1945.
Neither the Germans nor the Japanese had the edge in technology that counted such as computers, mass production, atomic weapons, or cryptography.
Henry Ford alone was manufacturing a heavy bomber EVERY MINUTE from a single one of his factories.
What idiots would go up against that level of industrial and technological might (besides idiots that don't realize how badly they'll be beaten)?!