Do you think this kind of method of preaching to a captive audience is effective? Do you think it's biblical? Do you think anyone really listens or people just get annoyed and tune out? Does it do the gospel message and/or the church's image more harm than good when people do this?
It will be effective if God wants it to be effective, and in the way He chooses it to be effective.
With the facts we have in the post, we might say there are general instances of it being in Scripture, e.g. even those preaching the gospel for wrong reasons, are in one sense commended.
15Some indeed preach Christ even of envy and strife; and some also of good will:
16The one preach Christ of contention, not sincerely, supposing to add affliction to my bonds:
17But the other of love, knowing that I am set for the defence of the gospel.
18What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.
Some, perhaps many or all will be annoyed and "tune out," but that does not limit God's ability to use it.
Nothing can really harm the gospel message, but circumstances can be used of God to make it more difficult for those who truly share it.
It would be wrong to share the gospel with the intention of harming the church, or its dissemination, but we are not given that as a basis here.
---------- Post added at 05:42 PM ---------- Previous post was at 05:27 PM ----------
Were these men who were called by the church and sent to preach the Word as part of the "ministry of the Word" of a local church body? If not, then they fall into the category of people who engage in evangelism solely on a one-on-one basis, without any connection to the Biblically mandated church organization and oversight.
This sort of practice is often an ecclesiology-free endeavor, even if the message itself is doctrinally sound. I don't know about this case, but I am commenting on the common practice.
It would seem that the issue of someone not being connected to a local communion of believers might be separate from the method.
It would be sin, whether by ignorance or rebellion, to live one's life, "ministry" apart from the visible body of Christ (e.g. no discipline, no taking of the Lord's supper, no tithing (giving), no service there).
It's also clear that God has specifically appointed people to carefully teach His Word and administer authority in the covenant community (church).
But we don't have enough information to even know how these folks were tied in to a local church (if at all).
But is it wrong for believers, who are not officers, to ever share the gospel in words in a perhaps unusual manner?
I don't think Scripture would say it is.
Further, even when it is done with wrong motives, the apostle commended it, because He recognized that the power of the Word of God is not dependent on technique, or motives of the person using it.
Those techniques or motives may be wrong biblically, but God is in no way limited in using it.