Well, because it's bigger than everything in existence, because I think "it's possible", that's all, not saying it is like that, just saying there is a lot we dont know, so... where does God lives? = maybe there, I dont know, I dont have to know, so, if you're looking for someone with all the answers, you will waste your whole life and never find that person because it doesn't exist.
However, I think you should "doubt" about what you think you "know". If you cannot change my mind, not even with the help of everyone in this forum, that's because you dont have solid evidence either, and on that matter you should doubt, otherwise, you're acting like a fanatic.