Is it true that the United States Air Force (USAF) played no role at all in winning WWII?

Yes.

The USAF wasn't it's own branch until 1947.

Prior to that it was the US Army Air Corps.

Technically true, given that the USAF didn't exist yet. The forerunner of modern Air Force was the United States Army Air Forces which was attached to the Army and not it's own branch during the war. The USAF wasn't formed until 1947, a few years after the war ended.

Yes, it is true. The US Army Air Corps became the US Army Air Forces during WW II. Not until 1947, a little less than two years after WW II was over, did it become the United States Air Force (USAF).

The United States Air Force did not exist in World War Two.

It was the Army Air Corps, and they did play a major role in world war two.

Enola Gay dropped the Atomic Bomb on Japan ending the war.

Are you shitting me? If your referring to the Army Air force then you have been terribly informed. The Army Air force suffered the highest casualty rate of all the branches. Up until DDay, there was a 75% death rate. The Army Air force made DDay possible and payed the heaviest price.

There was no such thing as the USAF during World War 2... it was called the US Army Air Corps back then.

Yes, it's true. Those bums didn't even start helping until 18 September 1947 - after the war ended.

Read what the German leadership themselves had to say after the war:

http://www.au.af.mil/au/awc/awcgate/ww2/nazis/nazi...

Edit:

That is like saying..there was no US Army or US Marine Corps in the Revolutionary War...it was the Continental Army and Continental Marines

I ain't buying into that logic