Every rabid atheist I've ever met has been disappointed by religion in some way. Usually it is because they didn't get something they wanted. One prayed that his brother would be returned from the dead. Another had a mother that prayed really really hard not to die of cancer and died. I've met atheists that had a failed bargain (If we get a good snow so I can go skiing, it's a sign that God exists). If God exists, why doesn't he worship ME. If there was really a God, no one would ever die, get sick, grow old, have car accidents or stub their toes. When I was a child first questioning the existence of God, I was convinced that there was no God because movies required paid tickets to get in. In a Just and Godly world, no one would have to pay for movie tickets.
Those are awfully petty, and none of those are even close to why many people left the church. I'm sure there are some people who did leave because of such childish reasons, but I don't know of any.
In my experience, it was two things: The first, being that I got tired of the hypocrisy. "Love thy neighbor" and "Help the poor" mean nothing if you spew venom about your neighbors whilst in the pews and scream at homeless people to get a job.
The second was just that, personally, I didn't feel the faith. I never asked for anything absurd like bringing people back from the dead, because I knew that was impossible unless you were, like, Jesus. I never asked for anything petty because I believed solidly in the phrase "God helps those who help themselves". Sure, sometimes people needed help, but that's when Good Christians were supposed to help those in need... help them help themselves.
I saw none of that growing up. I think that's why I lost the faith.
That said, I'm not a rabid atheist. I'm just... a nonbeliever.
I grew out of such nonsense. Atheists grow into such nonsense. God is the concierge of mankind. He exists to serve mankind and since not everyone wins the lottery, He cannot exist. It is a flaw in the atheist understanding of the nature of God and the relationship between Man and God.
I would hope that most people don't think that way. We are but puny humans, and no deity - whether it be God or Zeus or Shiva - is going to answer petty prayers.
God sometimes does answer petty prayers. I made one. I prayed for a new car because mine was so decrepit and my life depended on a car. I got my car, even though it ended up being a torment. Sometimes God answers prayers no one has made. He bestows gifts no one has asked for. That too happened to me. My relationship with the Lord is intensely personal. You have lost your faith. That has nothing to do with God. It means you have lost your faith. Possibly because you put that faith in other men.
So..... you have made your god into a used car salesman.
Isn't that kind of belittling?