Sam2, i never said the existence of God cannot be proven. The fact that He created the universe from nothing cannot be proven. Look in the ????? on Yesodei Hatorah in the very beginning (Perek 1;1).
But if you dont like that one, prove to me that Mashiach will come. Its purely belief based, not logical in any way, yet if someone denies his coming, ??? ?? ??? ????? ???.