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And which human being has the Holy Spirit and is truly being led by the Holy Spirit?

How to recognize a brother or sister in Christ?

First, we must have "ears to hear" which is a gift from the Father:

My sheep hear my voice, and I know them, and they follow me: - John 10:27

And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father. – John 6:65

And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed [it] unto thee, but my Father which is in heaven. – Matt 16:17

Then we notice the fruits. A bad tree cannot produce good fruit (Matt 7) The fruits of the Spirit are: love, joy, peace, patience, kindness, goodness, gentleness, faithfulness and self-control (paraphrased from Galatians 5.)

And when he speaks, we recognize his testimony:

Wherefore I give you to understand, that no man speaking by the Spirit of God calleth Jesus accursed: and [that] no man can say that Jesus is the Lord, but by the Holy Ghost. – I Cor 12:3

And from that point forward, it is conversing in a Spiritual language - that those who are not brothers and sisters in Christ cannot understand:

Howbeit we speak wisdom among them that are perfect: yet not the wisdom of this world, nor of the princes of this world, that come to nought: But we speak the wisdom of God in a mystery, [even] the hidden [wisdom], which God ordained before the world unto our glory: Which none of the princes of this world knew: for had they known [it], they would not have crucified the Lord of glory.

But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.

But God hath revealed [them] unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God. For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.

Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God. Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual.

But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know [them], because they are spiritually discerned. But he that is spiritual judgeth all things, yet he himself is judged of no man. For who hath known the mind of the Lord, that he may instruct him? But we have the mind of Christ. II Cor 2:6-16