I do love the "calm down, you are being fooled by a clever prophet" attitude.  However, there is proof that it actually happened.  For one thing, the tomb was sealed and guards were posted.  During Roman times, if the Emperors seal was placed on anything, there was a penalty of death to open it.  No Jew would have been foolish enough to go steal the body.  For another, there were many recorded witnesses.  Third, when Peter and John arrived at the tomb after the women reported He was missing, John walked in and noticed that the burial clothes were folded and laid neatly.  He traveled with Jesus for three years so he knew His habits.  He knew Jesus was alive because of that bit of evidence.  Even though faith is the belief in the unseen, it doesn't hurt to back it up with facts.