Galatians 5:18-21 lists the traits that prove that a person is unsaved, regardless of his profession of faith:
"19 Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness,
20 idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies,
21 envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God."
Notice "selfish ambitions." The KJV translates this word as "strifes." The Greek word refers to people who are willing to fight to advance themselves.
In my first church after graduation, the pastor¡s wife had steadily seized pastoral authority, bullying the staff and accomplishing nothing. They had 75 kids in children's church, and the pastor put me in charge. We worked hard and got it up to 300. One day I was called into his office where an enraged group of women, led by his wife, demanded that they be put in charge of children's church. None of them went soul-winning, but they won.
Three years later, children's church was running less than 10 kids.
I later learned from Christian school teachers that many of them had similar experiences. A person would seize a successful ministry, claiming to be a superior Christian whom God had appointed as a leader, and then they would wreck the ministry.
Some time back, I drove the scorners into rage by talking about people who seize church positions without God calling them. Galatians 5:19-21 shows that these people are not born again.