The difference, of course, is that people who resisted the communists etc. had a chance of success. You might die, or you might escape to a better life. If you really believed that an omnipotent, omniscient god existed and would send you to hell for failure to obey him, there's no way out of it. I'm guessing that close to zero people would have tried to defect if they thought that their chances of success were zero. Also, the worst they were facing was being shot. An eternity of torture is considerably worse. Even people who might tell the communists "I'll never cooperate, just go ahead and kill me" would probably do whatever they thought was necessary to avoid hell. You say "If god does exist, I'll take my chances in hell," but you only say that because you think the odds of such a god and hell actually existing are very low. If you really believed that the christian god existed, you would have to be crazy not to obey him.
There would still be people who try it, regardless of the anticipated outcome. Some people would rather die (like me) than to feign allegiance to an authority that they don't respect.
While there was higher than a zero chance of success trying to get out of Cold War Berlin, the chances were still pretty slim. People knowingly risked their lives anyway, even with the knowledge that quite a few have been killed trying to escape.
You do know that there are books written for the bible that were banned, don't you? Some of those books contained information along the lines of if you did get sent to hell, and someone in heaven asked god to forgive you, he would and would bring you into heaven. There are other books that say you don't go to hell for an eternity, just as long as your sentence requires. Why were these kinds of books banned? Seems to me that they would indeed give followers that 'chance of success' you mention above.
And given that the discussion of hell itself is so subjective and varied, what makes you think that hell, if it does indeed exist, is all 'gnashing of teeth and fire and brimstone'?
Look, I'm just doing a direct comparison.
According to the bible, man was made in god's image. We are god's children, yet he doesn't treat us like his children. If there was a Galactic or Universal Division of Child Services, they would come and take us away from him for being a shitty parent.
What parent would sit back and let their children get into lethal skirmishes?
Do you have children, Nasor?
If you do, what would you do if they just started beating the shit out of one another (due to difference of opinion on something)? Would you stand back and let one of them kill the other (like God often does) or would you put a stop to it?
EDIT:
Found some relative info on the banned books:
http://en.wikipedia.org/wiki/Banned_from_the_Bible
The Gospel of Nicodemus
Main article: Gospel of Nicodemus
Believed to have been written in the 3rd or 4th century due to the testimonies of the early church fathers, this is a story of Jesus’s trial, execution and brief descent into Hell. Hell in this book is a place where everyone is destined to go and Jesus ventures there to free many of the early church patriarchs and martyrs.
Many scholars, as well as early church leaders[who?], feel it’s a forgery to gain converts by impressing upon an individual the Savior’s power over Satan. Others see it as a redundant compilation of all other stories previously written. Finally, many of the early church fathers deemed its description of the underworld as too speculative because they viewed Hell as a state of mind and not a physical place.
The Apocalypse of Peter
Main article: Apocalypse of Peter
A contender with the Revelation of John, this work fell out of favor with the early leaders as they doubted its authorship and the fact that Revelation was better written.
During the time of the Christian persecutions, many apocalyptic literature was in circulation to console the faithful that the evil empire (Rome) was going to have justice served on it.
This book gives a gruesome detailed account of what Hell is like. It also suggests a way out of Hell for evildoers. If a consensus of heavenly angels decide to beseech the Lord to forgive their sins, they can escape. Church leaders were opposed to such a concept because that would mean that anyone can sin all they wanted because ultimately all will be saved
At best, it sounds like some of the early bible writers just wanted a way to control the population by fear.