Not at all. Based on years of study and listening to what people say and do. For example, if a person says they speak in tongues you know they are not a devotee of the reformed doctrine.
If a person says they are four square on baptism by immersion then the chances are that they attend a Baptist Church.
And if you lived in the UK in the sixties and a person talked about the supernatural chances are they were part of the restoration movement.
So no, you are wrong because the scripture says by their fruits you will know them.
I had a lot of Brethren in my background, but I had already experienced the baptism of the spirit so although they denied there was such a thing it did not phase me because I knew the reality of it.
I ended up in a church started by a Brethren Elder who had been baptized in the Spirit. They told him to give it up or leave the Brethren so he left.
The church became one of the greatest expressions of church life in the restoration movement as there was the supernatural at work in almost every meeting.
People came from all over the country, Europe and America to see what was so dynamic about it.
And yet out of all of that, I saw no testimony how that glorified Jesus Christ at all. All I saw was how special those people are by having that phenomenon, thus alluding that saved believers are missing out on something, thus unwittingly, giving another calling, another Jesus, another baptism of the Holy Ghost apart from salvation, and thus another gospel.
Didn't Jesus say that when one is born again, there is no sign?
John 3:7 Marvel not that I said unto thee, Ye must be born again. 8 The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.
Did not Nicodemus asked the question how one is born again and did not Jesus told him how?
John 3:9 Nicodemus answered and said unto him, How can these things be? 10 Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things? 11 Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. 12 If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? 13 And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven. 14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: 15 That whosoever believeth in him should not perish, but have eternal life. 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
What did Paul say?
Hebrews 11:1Now faith is the substance of things hoped for, the evidence of things not seen. 2 For by it the elders obtained a good report.
Galatians 3:14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith....26 For ye are all the children of God by faith in Christ Jesus.
Reads to me that you are not serving the Lord Jesus Christ in seeking His glory but something else in His name by which others can glory by.
Do consider that in normal prayer.