Ushalk, just because they call themselves a church and carry the label Christians doesn't mean anything unless they truly walk with Christ. For such "churches" as you're describing, nothing but a cult.
Check this out:
[quoteit]1 John 2:18-19
Warning Concerning Antichrists
<sup value="18" class="versenum" id="en-ESV-30552">18</sup>Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour. <sup value="19" class="versenum" id="en-ESV-30553">19</sup> They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us.
[/quoteit]
As you can see in the Scripture above, only those who truly walk with Christ are genuine children of GOD. Everyone else can talk the talk all they want and play the Pharisee, in the end they will be dealt with.
This is the Matthew Henry commentary on the above:
Some account of these seducers or antichrists. 1. More positively. They were once entertainers or professors of apostolical doctrine: "They went out from us (v. 19), from our company and communion;’’ possibly from the church of Jerusalem, or some of the churches of Judea, as Acts 15:1, Certain men came down from Judea, and taught the brethren, etc. The purest churches may have their apostates and revolters; the apostolic doctrine did not convert all whom it convinced of its truth. 2. More privately.
"They were not inwardly such as we are: But they were not of us; they had not from the heart obeyed the form of sound doctrine delivered to them; they were not of our union with Christ the head.’’ Then here is, (1.) The reason upon which it is concluded that they were not of us, were not what they pretended, or what we are, and that is their actual defection: "For, if they had been of us, they would no doubt have continued with us (v. 19); had the sacred truth been rooted in their hearts it would have held them with us; had they had the anointing from above, by which they had been made true and real Christians, they would not have turned antichrists.’’
Those that apostatize from religion sufficiently indicate that, before, they were hypocrites in religion: those who have imbibed the spirit of gospel truth have a good preservative against destructive error. (2.) The reason why they are permitted thus to depart from apostolical doctrine and communion—that their insincerity may be detected: But this was done (or they went out) that they might be made manifest that they were not all of us, v. 19. The church knows not well who are its vital members and who are not; and therefore the church, considered as internally sanctified, may well be styled invisible.
Some of the hypocritical must be manifested here, and that for their own shame and benefit too, in their reduction to the truth, if they have not sinned unto death, and for the terror and caution of others. You therefore, beloved, seeing you know these things before, beware lest you also, being led away with the error of the wicked, fall from your own stedfastness. But grow in grace, etc., 2 Pt. 3:17, 18.
