An Easter Meditation

 If any of the soldiers at the tomb converted and were executed, they would have been the first martyrs, martyred even before Steven, Proto-Martyr. That seems unlikely. I mean, how would the Church have missed that?

So, conversion-execution definitely didn't happen.

If any of the soldiers guarding the tomb converted but were not martyred, everyone was very quiet about it. Think of the picayune details that we are given. We even know Joseph of Nicodemus donated the tomb. That's a pretty minor player. But, despite naming all these minor players, no one mentions the soldier(s) who converted as a result of what they saw at the tomb? Seriously? They talk about every other player, even women, but not actual eyewitnesses to the actual resurrection?

But you imply Luke was thinking to himself, "Sure, I've interviewed a lot of witnesses for my Gospel and for Acts, and soldier George is an eye witness to the single most important event in this entire story, the very reason we are even writing any of this down... Because of what he personally witnessed, he became a follower of Jesus Christ.... hmm...

However, in the 'cons' column, soldier George isn't an apostle, so his conversion story and the details of what he saw at the tomb aren't nearly as important as all the things that the women and the apostles DID NOT see, so ... yeah.... let's leave George's account out. It is not really relevant"

Somehow, I doubt that would be Luke's reaction to news that a Roman guard converted as a result of what he saw at the tomb. 

Which indicates that none of the soldiers who actually would have been eyewitnesses to the actual event of the resurrection ever converted.

FYI, the story of  Longinus doesn't appear until the fourth century. The soldier's name was unknown to the Gospel writers, but the Gospel of Nicodemus, from which the name first derives, also names the thieves on either side of Jesus.