*steps in shyly*
Well, I don't think that there is any solid and undeniable evidence for the existence of God. However, I do believe that there are possible clues (or signs) of His existence. And some of those clues are present in things that we see every day such as the variety of living things, the plants, the foods that we eat, the water that we drink, sex, reproduction, our brains, our hearts, emotions, intelligence, consciousness, the earth, and many other things. To me, all of these things are clues for the existence of God, or the existence of something intelligent operating in the universe, whether it is a person, a program, a field of consciousness, or whatever it is. In other words, I believe that there is a mind behind all of this and not simply a result of blind and accidental forces because that seems very unlikely to me although still possible.
I don't actually know what is Allah (or God). As Muslims, we only claim to know Allah's secondary attributes (which are mentioned in the Quran), but we do not know Allah's primary attribute as the Quran says,
"No vision can grasp Him, but His grasp is over all vision. He is above all comprehension, yet is acquainted with all things" (6:103). And He doesn't show Himself to us directly, but we believe that He manifests Himself in other ways, i.e. through the Prophets, the scriptures, and through His creations.
If God revealed Himself, then there wouldn't be any value or reward in believing in Him because He already showed Himself. It would be kind of like giving away the answer.
I don't think that it's possible to prove God through logical arguments either. Why? Because to do that we have to know certain things and/or qualities of God which are not possible to know, and therefore, we can't be too sure if all the premises are true or not. We have to understand God's essential nature (or His primary attribute) before we attempt to form any ontological proofs, but that is not possible since God is something/someone beyond our comprehension.
But then the question is, what are the reasons for me thinking that this specific god and this specific religion is most likely to be true out of all the other ones?
I've made a much longer post where I answered that question and I put down more of my ideas in the thread below:
http://atheistforums.org/thread-11855.html