First off, the Germans were very, very far from doing anything threatening with nuclear weapons. They were struggling to create a prototype chain reactor when they were overcome by the allies, and they came close but failed. The Americans, meanwhile, had accomplished this in Dec. 1942 at the U of Chicago -- and still took 3 years to make bombs, even dedicating HUGE resources to it (~equivalent to $21.5 billion today, nearly as much as the ~equivalent $24 billion the US spent on all small arms for the entire war) -- and Germany was dedicating almost no resources to the program at all (the US built entire towns for the project, Germany assigned about 40 scientists). Finally, there is some controversy over whether Heisenburg, the head of the German project, was intending to ever create a bomb at all.the time they distroyed the heavy water plant ... (Heavy water was needed for nuclear bombs) they
were 45 days away from full production when the arm forces distroyed the heavy water plant.
Secondly, the lack of heavy water wasn't a big deal; there wasn't enough being made in the entire world to enable any serious production, and while it's theoretically possible to achieve a chain reaction with heavy water it's really, really hard to do. Graphite is far superior and is what enabled American production.
Thirdly, it's very doubtful a couple of atomic bombs in the hands of the Germans at that late date would have accomplished anything. The blitz did far more damage than any bomb was likely to accomplish, and did little more than solidify the British resolve to resist.
To correct a few errors, though: there were no "live" (using fissionables) misfirings during the American program, although it was a huge concern. We also did have another bomb available when the war ended.
Although I'm not a believer, I will forward that logic is pretty worthless for disproving religious possibility. You can't prove something doesn't exist; and you can't prove that something you don't know about has no effect on anything. Indeed, the fact that we constantly find new forces and phenomena is actually a very strong argument in favor of the existence of "things beyond our understanding."Aristotle gave us the logical system with which we today can invalidate all the supernatural claims of any religion.
Hope is generally the biggest appeal, I would expect: we all fear death and the unknown it contains, and the promise of a heaven (and threat of a hell) are pretty strong motivators. In the same way, it gives a purpose to life, something everyone struggles with at some point. It also gives a morality and method for a stable society. Also, the existence of a benevolent being willing and able to work in favor of its followers was one of the original big selling points: precursors like Zeus were followed because their wrath was feared, not because they were swell personalities.You still haven't answered why anybody would convert to christianity to begin with. Why and what could they gain from it?