Wittgenstein's mysticism can be summed up like this. The word "hornet" connects somehow with the real insect, but, when I try to explain what the connection is, I am left with nonsense--this is the mystic--it is how the world is "this is the mystical."
He writes only a few lines about God, but I think he acomplishes more than most writers on this subject, since, as he points out in his "motto": "All that a man knows can be said in three words."
But the book itself isn't important. See the penultimate proposition: all the previous propositions are nonsense--a "ladder" intended to help you "climb out of the hole" of philosophical misunderstanding. Once this is done the ladder can be thrown away. (I recommend keeping your copy, just in case you fall in the hole again).
The final proposition, therefore the only nonsensical one, is Proposition 7: Whereof one cannot speak, one must be silent.