Don't thank god. Thank those who invented it before the germans, and those that prevented the germans from having it. 
You can thank Hitler himself for that. He never believed in a war that would last long enough to require a nuclear weapon.
The Germans had the ideas but, from what I remember, Hitler saw it as a waste of resources that were better focused on developing more convential weapons.
As I understand it, he held such weapons back in the way he held the Me 262 back as a 'bomber'.
One of my customers was 9 years old and on the eastern side of Germany when the Russians came through. He and a bunch of other kids used to roll debris off roofs onto passing Russian soldiers. He is lucky he wasn't killed on the spot.
He witnessed the lynching of a downed B-17 crew by farmers with pitch-forks and shovels, too.
He is also the most racist person I have ever met and even he is glad that Hitler held back the major weapons so that Germany did not have to suffer the same fate as Japan.