If you're referring to the A-bomb, no. Germany was defeated without it, and the Japanese military didn't really care if civilians were turned to ashes.
You could argue that a combination of events ended the Pacific War, including starvation, no fuel, Russians advancing in the north, the destruction of the Japanese navy by the USA, the destruction of the Japanese army in Manchuria/Russian border, plus the A-bomb.
The Japanese Emperor was a world-class marine biologist and understood the A-bomb in general terms, but had very little influence over the military. He did a radio broadcast and survived retaliation from the military, so he does get credit for that.
Hitler and the Japanese military were die-hard end-of-the-world types. Important to realize when dealing with other tyrants. For them, there is no Plan B or surrender.
Germany was defeated, but the USSR was on a roll.
Without the A-bomb, there’s a decent chance the Soviet Union would’ve pushed the Anglo-Americans out of the continental Europe.
Regarding your hope: I very much doubt we’ll get to experience the following stage in our lifetime.
1. It’s amazing to think just how much steam: just as an example, you could argue that physicists determined the outcome of WWII, and with it the whole path of civilization.