Well it doesn't have to be 500, but if 200 of 500 witnessses became evangelists to the world it would make more sense than the alternative. The alternative being the heavily entrenched system of Roman and Greek gods (so entrenched that huge expensive labor intensive temples were put up in their honor)
http://en.wikipedia.org/wiki/Roman_temple#List_of_Roman_temples
was brought down by Peter, Paul, and the 11 other apostles who came from a distant provence with no communication other than their own voices and a few handwritten letters.
No, DOC, even 200 working for 20 years would make the scene that Paul finds highly unlikely; maybe twelve or thirteen would be more like it. There simply was not a massive conversion prior to Paul's evangelism. Clearly there were people working, but again, this was 15-20 years after Jesus died (at least that is when we have Paul's letters, the first that survives being written probably in 50 CE). Someone was doing something to spread the faith during that time period. The available evidence would suggest, however, that it was not a very large number, not 500, not 200, spreading out immediately in evangelistic efforts. It probably spread from community to community slowly in those early years with small groups hitting the big urban centers like Rome, Corinth, Antioch, etc. If there were massive conversions as suggested in Acts, then the faith would have spread so quickly that the Empire would have been completely converted in 20 years. We know that didn't happen.
Um, Peter and Paul brought down the heavily entrenched system of Greek and Roman gods? What? Do you even know what the polytheistic systems looked like? You do know that mystery religions spread rapidly during this age of dislocations and diasporas and that Christianity fit into this mold very nicely; that Isis worship nearly beat out Christianity in its initial spread? You do know that Christinity's adherants by the mid 4th century amounted to approximately 5-7% of the population (see Rodney Stark) and that it did not become a major religion in the Empire until Constantine's conversion? You do know that these mythical systems persisted for thousands of years before their decline and that what did them in was the exclusivity of Christianity and later Islam (polytheism means that you can always add a new god, but monotheism insists that polytheism must die)?
Peter and Paul brought nothing down. It was a series of historical contingencies that resulted in Christianity's spread in Europe. Doesn't it seem strange to you that it spread primarily in the regions that were Hellenized and then taken over by the Romans, but that it spread in only a limited way in the rest of the world? Did Luke get it wrong? I thought he implied that the message could not be stopped because it was spread by the Holy Spirit. While it has adherants in all of these places, why has it not taken over China, the mid-East, sub-Saharan Africa, Polynesia?
You like someone else in here added the word "the voice" instead "a voice" in Acts 9:7 .
If you take the passage literally the voice could have been Paul's who was talking to Christ or maybe even someone nearby not in the group. And Acts 9:7 was probably written by someone else (probably Luke) since it is in 3rd person.
But the verse Acts 22:9 says...
22:9 And they that were with me saw indeed the light, and were afraid; but they heard not the voice of him that spake to me.
...and written in 1st person and is Paul speaking himself. If we are to believe what Paul said it was the light that made them afraid.
Although these two verses (which seem to be written by 2 different people) are not the clearest in the world (when you compare them) there is no contradiction when you take them literally.
I didn't add or subtract anything. I quoted a translation, as did you. Whether there is a definite or indefinite article matters not. The sense of the passage has the companions standing dumbfounded because they hear the (or a) voice but could not see the (or a) body that went with the (or a) voice. If we are speaking of Paul's voice the passage makes no sense, since they next pick Paul off the ground where he has fallen (Oh, yeah, and in a later passage they fall to the ground too instead of standing unable to speak). There is no mention in this passage -- none -- that they see the light.
The latter passage is not Paul speaking to himself. In Acts 22 he addresses the Jews of Jerusalem and in Acts 24 he addresses the Roman governor.
Quibbling over a word in a translation is a fool's errand. If you want to know what is in the text, then read it in Greek; but even there you've got serious problems because many of the actual words have been changed over time -- usually from simple copying errors or misspellings, but sometimes for theological reasons. This particular passage would almost assuredly not have been changed for theological reasons, but we cannot be precisely sure of the actual Greek words for it because we only have these words through the gift of copies of copies of copies.
Did I mention they were in Greek and not the King's English? And did I mention that it doesn't matter anyway, since the sense of the passage does not depend on whether the article is indefinite or definite, but the surrounding information?
From Wiki's article "List of Christian martyrs"
* Saint Stephen, Protomartyr, was stoned c. 34 A.D.
* James the Great (Son of Zebedee) was beheaded in 44A.D.
* Philip the Apostle was crucified in 54 A.D.
* Matthew the Evangelist killed with a halberd in 60 A.D.
* James the Just, beaten to death with a club after being crucified and stoned.
* Matthias was stoned and beheaded.
* Saint Andrew, St. Peter's brother, was crucified.
* Mark was beaten to death.
* Saint Peter, crucified upside-down.
* Apostle Paul, beheaded in Rome.
* Saint Jude was crucified.
* Saint Bartholomew flayed alive and crucified.
* Thomas the Apostle was killed with a spear.
* Luke the Evangelist was hanged.
* Simon the Zealot was crucified in 74 A.D.
First, thank you for making my point -- there were precious few early martyrs, even if you take these as accurate. Do you have any idea where this info comes from? Do you suggest that all the info in that list is correct in an historical and not purely literary sense, without exception. Before proceeding further I would like an answer to that because much depends on it.
You can answer one other question that you left unanswered earlier -- do you believe that early Christians created stories about Jesus, or do you think that every single story, every single word written about him was absolutely correct? If an apostle supposedly wrote it, does that make it true? Did Jesus really cause someone's hand to whither? Was Thomas really Jesus's identical twin brother? Do you realize what a quagmire you have entered?
ETA:
The point I made was that the Romans did not, as is commonly perceived, institute Empire-wide persecutions of Christians until the 4th century. It was Jews who initially persecuted some Christians, and there is some evidence of rejection from pagan citizens -- witness Paul's mention of the early Thessalonian church. It simply was not particularly dangerous to be a Christian. It was dangerous to disturb the peace as some of the evanglizers, if they existed as is portrayed in Acts, did. That was the only problem -- disturbing the peace, at least from the Roman perspective -- not being Christian.