There are at least 2 places in the Bible (one in Isaiah) that tell us that in the next life we will never remember any of this. It will never come to mind.
So, it is not that you don't believe in God. Rather, it is that you are angry with Him for not judging things according to the way you think.
Don't throw away eternity for yourself. Having the pleasure of some deep anger against God in this life (though I don't see where there is pleasure in anger), is not worth losing your salvation for eternity.
Rather, humble yourself, and ask God to comfort you and bring peace to your mind and soul.

''Rather, it is that you are angry with Him for not judging things according to the way you think.'' Actually as you can clearly see from my example above, I'm not angry or happy, it simply makes no sense and it's not fair.