First, he preached Judaism. His preaching, in and of itself, would not have gotten him in trouble. It was his claim (vision) that he could see God and the Son of Man sitting to the right (seat of honor) of God that got him in trouble.
The OT states that no one has seen God and lived, and such statements were considered blasphemy by the Jews, which, according to the Law written by God himself, and dictated word for word to Moses, was punishable by stoning to death.
Besides, I would hardly call a vision "preaching the word", but you are free to believe whatever you want. It's just not what the Bible says. Besides, Paul's heart doesn;t seem to have been opened by Stephen's preaching, as you said. Rather, Paul was enraged by what every Jew would have understood to be Stephen's blasphemy.
You continue to ignore biblical directives that Christians are not bound to perpetuate futility with resistant non-believers or believers
And you continue to ignore the ones given by God himself—that Christians are to love their neighbor as themselves—as not something optional. Therefore I asked you twice at which point would you give up on your loved ones?
Perhaps Moses should have given up after the third plague failed to convince the Pharaoh? You can imagine what good that would have done.
I suspect you’d like it to be a violation due to your incessant need to throw unbelief at believers
And, perhaps you have a need to throw your belief at unbelievers and then imply the same, but reverse motives to others. I have no such needs. I have only questions when I don't see something I agree with.
I don’t know if that’s to assuage your own doubts, to attempt to undermine their faith, or because you’re bothered by loneliness...or something else
I have no desire to undermine anyone's faith but to ask honest questions when I see something that doesn't fit. But I can sense that something is not right when I run into people who are too easily offended when questioned.
On the basis of the above, and other statements of non-belief, if you were in my parish, I'd have to deny communion to you. That is an act of love, but it is also, as Paul would say, a delivering "to satan for the destruction of the flesh that the spirit may be saved in the day of the Lord Jesus."
Unbelief is the unforgiveable sin...IF...it isn't overcome.