This confuses me. You say that we could not understand or judge God based off our own logic, cause we are just men. So why presume that you know anything about God at all? Why Presume God is good? or that God cares? Why not simply acknowledge that we cannot even begin to understand God?
The very thing that you are accusing him of doing you're doing yourself. You are saying that God's purpose is trial, who are you to decide what God's purpose is? Even if it is Trial, what grounds do you stand to be able to determine what that trial actually is?
Also what ground do you stand to say that are minds our limited? We've been to space, we can photograph galaxies, we can create amino acids under controlled situations, we can clone animals from blood, we can grow body parts from stem cells, in technology we have advance so much. Look at the computer you are using right now, 50 years ago it would be the size of the room that you sit in, your phone sends messages through space. Look at a CD player, heck listen to a MP3 player, we use electricity to produce sound recorded by people who we have never met. Where is the limit of our minds exactly? What grounds do you have to say that it is limited? What proof do you have that God does not want us to actually know, and even if you have that proof, if our minds are so limited where do you stand to say that you actually understand it? You say 70 years isn't long? That's the average now, an average which didn't exist 70 years ago. So it's a pretty big deal.
You're saying he does not understand God, but you do...but aren't you a man yourself? Also it's Gehenna not hell if i remember the translation correctly.