Without WWII the entire world is utterly different, trying to game it out is basically pointless and impossible.
Just as one example, without WWII the British Empire likely remains intact. That alone utterly changes global politics for the next fifty years.
Or the fact that without WWII the Soviet Union is never really able to expand its borders and become the true global power that it became. Again, that entirely rewrites the next fifty years.
And what do you mean "without WWII in Europe"? I mean do the Nazi's still come to power in Germany and how much are they able to conquer without it being WWII?
Because say that the Nazi's stop at the Vistula River and set that as their border with the USSR before turning south and towards Turkey.
If the Nazi's are slightly more intelligent/less arrogant, they probably could have built a Nazi Empire across most of Europe that would last. Everything from France to Warsaw and south to Istanbul (excluding Italy) could fairly credibly become a permanent part of the Nazi Empire without "WWII in Europe" actually occurring. Stalin isn't going to join the fight if the Nazi's actually stop advacing the border at Warsaw, he's simply not in a position to do so. The British don't have the ability to land substantial forces on continental Europe. The US can't (and won't) move absent the USSR (and especially absent Pearl Harbor).
Nazi's secure Europe and then, in conjunction with the Italians and Spanish, block the Strait of Gibraltar (just mine the hell out of it) and the whole Med becomes effectively a private Axis lake.
How a Nazi unified Europe changes the global political equation is another one of those things that is basically impossible to game out.
Now start trying to figure out how some or all of these things interact with one another. A British Empire that has seen Europe fall to a German Empire is going to have very different geopolitical goals (and reach) than a British Empire that has exhausted itself fighting that German Empire and found itself reliant on the US. What are BE/USSR relations like with a Nazi Germany in the middle?
Hell, what is the global situation like when France is no longer a player at all?
What is the US like if it doesn't fight WWII in Europe? For one, it would very likely be far more focused on the Pacific theater while everyone else is far more focused on the European theater. For another, without the threat of the USSR unifying Europe the US is likely to make different policy choices in relation to Japan and the Pacific.
For example, trade with Europe means getting involved in the three way tug of war between the BE, Nazis, and USSR. Not going to be a lot of US investment or trade with European markets at the time. The Pacific though? That merely involves cutting a deal with the BE to some extent. You could easily see massive investment into China (not just in cash but in political bandwidth and military power as well) and it becoming basically a captive US market.
Basically, too many unknowns to give anything like an accurate answer.