I do not deny God's presence, but I still think about the possibility sometimes. Whenever I have an argument on this topic with anyone, I would almost all the time fight like a 100% non-believer and attribute all the events taking place to sheer randomness and chaos.
I guess, this world, is the best example chaos and randomness. If there were God, he must be doing real good to manage everything though. So, wouldn't it make God's life easier if we prayed only for those things which we really really wanted?