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John was the Beloved Disciple, and took Mary into his home after the Crucifixion. There's one eyewitness. Matthew was the tax collector personally called by Christ. There's another.

Luke was St. Paul's secretary. Not an eyewitness, but took down the testimony of many eyewitnesses in his capacity as scribe to a very active Apostle. But, as I said earlier, much eyewitness testimony is taken down by another rather than written by the eyewitness himself (e.g. Tacitus and Pliny the Younger).

Here is a site that goes into excruciating detail regarding the historicity and authorship of the Gospels. From my observation, the author has a good working knowledge of the classical texts as well as the Church Fathers.

(John 20:24-29 NIV) Now Thomas (called Didymus), one of the Twelve, was not with the disciples when Jesus came. {25} So the other disciples told him, "We have seen the Lord!" But he said to them, "Unless I see the nail marks in his hands and put my finger where the nails were, and put my hand into his side, I will not believe (pisteuo) it." {26} A week later his disciples were in the house again, and Thomas was with them. Though the doors were locked, Jesus came and stood among them and said, "Peace be with you!" {27} Then he said to Thomas, "Put your finger here; see my hands. Reach out your hand and put it into my side. Stop doubting and believe." {28} Thomas said to him, "My Lord and my God!" {29} Then Jesus told him, "Because you have seen me, you have believed; blessed are those who have not seen and yet have believed."

Hopefully, the Doubting Thomas in Italy will be assessed court costs and be subject to a penalty for a frivolous lawsuit.