Always, ALWAYS compare what is being said or taught, to the Word of God.
If someone says or teaches a THING. And there is a verse that is contrary to that THING, Then that THING is wrong.
If what you believe contradicts even one verse in Scriptures, then change your belief. Do NOT change the Scriptures to line up with your own belief, but change your belief to line up with Scriptures. This is NOT an easy thing to do.
How many have been taught their own lives that once you are Saved, you are always Saved, and can't possibly lose it. This is what human preachers have been teaching for eons, correct?
Now when a person gets Saved, their name is written in the Book of Life, Who would not agree with that Truth?
And yet we see plain Scriptures that teaches a person name can be blotted out of the Book of Life? Which plainly means, their name WAS written in the Book of Life, but is no longer written in the Book of Life. Therefore the belief of Once Saved Always Saved (OSAS), can't possibly be Truth, if a person name can be blotted out of the Book of Life.
How hard then would it be for a person to NO LONGER believe, what they have believed their whole entire lives. VERY HARD indeed, so they would much rather find fault, or change, or interpret away, or make void, or ignore the verses which plainly reveals once a person is Saved, they can lose it. THAT IS EASIER, then to change what you have believed your whole life, from human preachers.
And many who believe in OSAS will say the pathetic logic, when someone gives them a scenario how a person WAS Saved, but is no longer Saved, and they will use the pathetic logic, "Well they were not Truly Saved to begin with" Made a video about that as well:
my point is, even though it will be extremely hard to do, change your belief to line up with All of Scriptures. Or you can freely choose to continue to be a Nicolaitan Christian, which chooses to believe in false doctrines instead of the Word of God.