Then the disciples were glad when they saw the Lord. As the Father has sent me, even so I send you. Now Thomas, one of the twelve, called the Twin, was not with them when Jesus came. Eight days later, his disciples were again in the house, and Thomas was with them. Blessed are those who have not seen and yet believe.
Computers have the power to resurrect the dead, at least on video anyway.
People long dead can be made to interact with the living in movies, programs, even commercials. Indeed there is a movie soon to be released whose main star although apparently human is a computer creation bearing no resemblence to anyone living or dead. Only what we can actually eyewitness is certain of being real, and even then as every street magician knows, the eyes can be fooled. Belief often becomes a matter of trust, and the more unbelievable the situation the more difficult it is to trust. This was the situation Thomas was in.