Ooh, Birdjaguar summoned me.
The problem with that view is that neither the Bible itself nor any of the early Christians, to my knowledge, ever call the Bible "the Word of God". On the contrary, the Bible says that's what Jesus is. There is no standard view among Christians of exactly what the Bible is or how it should be interpreted or what authority it has, though in practice they all think it has some kind of authority. You will not find any guidance on the matter in the Nicene Creed or any of the authoritative councils.
I've never heard anyone claim that. On the contrary, koine Greek was the most common language in the ancient eastern Mediterranean, so it's perfectly natural that Christians spoke it, especially given that - according to Acts, at least - Antioch was one of the major centres of the religion. Whether Jesus himself or his immediate disciples spoke Greek is a moot point, but it doesn't really matter as there's no reason to think that any of them wrote any part of the New Testament. But there's certainly no reason other than snobbery to suppose that "working class Jews of lowly profession" couldn't speak Greek. Paul was a tent maker and he seems to have got by.
That depends on when and where you're talking about, of course. As far as I know there's no evidence for really substantial numbers of Christians being executed, in the way you're describing, until the fourth and fifth centuries, and that was in the Sassanian Empire, not any Greek-speaking region. No-one knows how many Christians were executed for their faith in the Roman empire but it probably wasn't a great number, and certainly not in the first century or so anywhere.