People claim miracles all the time; I doubt a real divinity would stoop to such performances, but even if so the burden of proof (that it is the truth) for a real miracle is virtually insurmountable, and given that we have no independent contemporary testimony the stories of Jesus are easily discounted.  

As far as "belief" goes, this is foolish of anything.  The best we can honestly do is hold the opinion that something is almost certainly true, and this level of confidence needs to be held in reserve for things like the sun rising tomorrow.  Religions make a virtue of "faith," when in fact it is a vice -- a giving in to our desire that something -- usually something we were taught as children while we were still uncritical -- be true.