It is amazing how a lot of atheists point fingers at theists for believing in a God and then laughing at them for trying to prove God exists -- all the while, many atheists are just as "sure" that god doesn't exist without sufficient proof for THEIR case.
Truth is, nobody on Earth knows the real truth. The only people who know what is going on are all DEAD. Since it is difficult to interview DEAD people, we just have insufficient information about what happens after death and whether or not this is all just a fluke show-and-tell show or if there is some deeper meaning to everything.
I am a theist. I believe in some creator to the universe but I doubt any specific religion encompasses the total truth. I do think that if you take bits and pieces from various religions, that you will get close to a truth, but the entire truth will always elude us until such a time that god himself chooses to pay us a visit.
That being said, I don't think we can blame god for anything in our lives or for the events that take place on Earth. I've had a lot of tough things happen in my life and I got very angry with god but then I realized it was a stupid thing to do on my part.
God, if one does exist, most likely gave us free-will. How we choose to exercise that free-will is totally up to us. The only way God could have prevented 9/11 from occurring was to affect the free-will of those couple dozen of muslim extremists. That apparently is not how god chooses to operate.
A couple of dozen of extremists crashed planes into our buildings and now approximately 3,000 people are dead. If you look at the situation, it could have been FAR FAR worse. We're lucky it is ONLY 3,000. Who are we to say that God didn't slightly adjust physics on that day to keep those towers from crashing down in a far more catastrophic way? We simply cannot say one way or another, but what we can say is that the free-will of those extremists was allowed to take its course.
Imagine if the planes had hit an hour later? What if the buildings toppled over and took out a few square blocks of other buildings and set off a huge fire that just incinerated the financial district?
Likewise, the worst part of the story about 3,000 people dying is not the fact that they are now dead, but the fact that some of them had to suffer. Thankfully, many of them were probably killed instantly. Some jumped to their death, but since they were so high up, once they hit the ground they probably were killed instantly as well.
We should thank god for giving us all the opportunity to process information, experience sensory input and grow as individuals. We shouldn't get angry with him due to others exercising one of the most baffling things in the universe -- free will.
Everyone has within them the opportunity to do whatever they so desire. Some of us are inclined to do things because of genetic biases, upbringing, etc -- but I am a firm believer that anyone can break through whatever limitations are imposed on them through those things and create their own path.