It implies that the Allies wouldn't have re-taken Europe, nor
occupied Germany if the Germans didn't have a nuclear program.
There's no way that Roosevelt or Churchill would allow the Russians access
to all of Europe.

Nazi Germany was the current challenge and SU was already ID by western allies
as next challenge.
Allies would have retaken Europe later and much more easily and would face a
much more weakened Stalin.
If Eisenhower were alive,I would love to ask him only one question,why he
thinks (in his book "Crusade in Europa") that if they were only a couple
months late,human kind would have possibly faced the greatest disaster of
history?
Lets remember the fate of NaziGermany was sealed in 1942,so,what kind of
disaster could possibly come from Germany in 1945?

Suggest that you get more of your info from the reality channel.

I am sure you mean the "official" channel.