hate to tell you, but merely resurrecting the dead would not be proof of anything. Lots of "scholars" claimed that Jesus was merely "revived" by some expert in medicine...(one reason many of these same people got upset at Gibson's "bloody" film was that he showed the extent of Jesus' wounding, making their story of a fast "revival" improbably-- heck, even with modern antibiotics and an ICU you'd take more than 36 hours to get up and around with those wounds).
In Africa, a person in a coma might be considered "dead" and then buried (like Muslims, they buried by sunset the day of death). Then the person would wake up, and be considered "resurrected".
The point with Lazarus was that he was dead (and, as Martha pointed out, stinking i.e. decomposing) but then was publically resurrected. This astounded people. A similar miracle was the man "born blind" who regained his sight. Lots of people with psychological blindess or other blindness that could come and go (glaucoma, trachoma flaring up with corneal opacity) were cured all the time. But people knew that you just didn't cure a person born blind...
So if a lot of people "resurrected" with the earthquake, and some were alive, it would only "prove" they were prmaturely buried to skeptics. If they had been long dead, they would be considered "hallucinations" or fraud.
Romans were superstitious, but most were hard nosed skeptics...even Luke, a trained doctor, didn't take the "gospels" as proof: He checked the sources before writing about Jesus....
And the Gospel of John, written the last, has details of the city of Jerusalem that were lost to history until modern archeology, because Jerusalem was destroyed in 70 AD.
Oh, my point wasn't that resurrection proves that Christ was God. The person I was replying to was stating that the lack of records in the works of official historians was proof that Christianity was a hoax. I was merely explaining that rumors did not travel quickly in those times and thus it was not a sign one way or another.
One ought not to believe merely because of miracles, but rather because of who Christ is. The miracles are all window dressing.