can you tell by sight? is it their conversation? sticker on their car? belonging to a church?
what is the measure or is their one?
and in keeping with the commission given by Christ how do we select our candidates for witnessing?
How can we tell someone who has been regenerated? I think that it is a number of things taken together, because any one of them taken alone does not mean the person is walking with God, it only means that they may be a good person...
1. you will know them by their fruit...the good do not produce bad fruit...
2. John says that if we ourselves are truly walking with God, we will know who really isn't by their doctrine...
I John 4:6
We are from God. Whoever knows God listens to us
; whoever is not from God does not listen to us. By this we know the Spirit of truth and the spirit of error
Of course, again, this is predicated by "we" actually walking with God as He lays it out, and not just someone who "thinks" he is walking with God.
3. They will manifest from time to time one of the gifts of the Spirit...he who does not have the Spirit is not Christ's, and the gifts of the Spirit according to Paul, are the manifestations of the Spirit for the good of all. This makes churches where none of the gifts are EVER manifested highly suspect, and I would not remain in such a church, personally.
4. They will walk in obedience to the Scriptures and manifest being changed into the image of Christ...they will manifest the fruit of the Spirit if they have been walking with God in truth after a while, and not just playing church. In other words, when he smashes his finger with a hammer, he won't start cussing his head off.
If a person doesn't manifest all of the above, then they might be suspect as not being regenerated...or possibly have been regenerated in the past but has since stopped walking with God. Part of the problem here is that many believe "once regenerated, always regenerated" in that it does not matter what one does after receiving regeneration, they will always be in saving relationship with God - but that is not what the Scriptures teach.