I see the presence of God in His creation. I feel Him when I pray and worship. I know He exists and I know He exists in me. It's true that I can't particularly document His existence with traditional evidence, nothing concrete. However, I know He is at work in me and on me, and I know one day I'll live with Him eternally in Heaven. For that, I am thankful.
I think that whatever theory or philosophy you take all the way back to creation ultimately relies on a seed of faith. Even if the route you take is science, eventually there has to be something that you take as a given.
I try not to impose my beliefs nor my faith in God in avenues that invite questions or argument (such as public forums like this one) - not because I do not wish to offend others or defend myself, but just because it is so overdone and mostly annoying at this point.
I do however believe in one God. I believe that I can and do have a personal relationship with him - and this is largely based on personal and emotional experiences. It is also based on that little seed of blind faith. If I'm going to have faith in something, I figure it might as well be something that brings me joy, comfort, and a sense of stability.
I hope, but I do not know.
It makes no sense to me that the universe could just exist by random chance. So that tends to make me assume that there must be a god. But the whole concept of a being with that kind of power is really almost beyond imagning. It is hard to just assume that there must be a being like that.
Then, if there is a god, I start to wonder about why that being would care about us...