Picture Christendom like a big ball

At the center of the ball is Christ and of all those since Adam that are saved closest to Christ occupy the space nearest to the center for rewards during the millennium-to-come, continuing outward to those saved that are the most carnal who will lose rewards. Perhaps only 1/100th of the space within the ball are actually the saved in the kingdom of heaven. The rest the Bible considers the tares in the kingdom of heaven.

Then divide off 3 dimensional quadrants based on beliefs and behaviors in shades and and degreeswith much overlapping. Nothing is absolute, it is always in shades and degrees, but ultimately God absolutely decides where the cutoff points are.

One could be a hyper-calvinist or an ambivalent one. One could be a hyper-gibberish-babbler or Pentecostal who doesn't like to do it. These are false teachings in all their forms but this does not mean they are always unsaved.

Oppositely, you could have all the right teachings, such as our being triparite, partial rapture, gap restoration, osas arminian and Biblical locality, and others, but not applying these truths, rending them merely as principles. Even worse such a person could be unsaved also, though that would be extremely rare compared to the great percentage unsaved portion of the calvinist babblers.

The reason a person with so much correct teaching would almost always be saved is because the teachings are reflective of the change in his spirit. He may lose that which he once had in spiritual life, but because the teaching is true, it is a powerful indicator of salvation. By losing the reality and joy (as though they are fresh and new every day) of those truths he may fall to carnality, as reflected in a change of position in the ball, but he is still within the 1/100th portion of the ball.

He cannot fall into the 99/100th portion of the ball; nor can those in the 99/100th portion enter into the 1/100th because they prefer to try to replicate the kingdom by their own strength to make a virtual carbon copy facsimile, but there is a defect that exposes the copy. We shall know them by their fruit, either behavior or ideas.