The judgment of (theologians and) humans means nothing.
We are forgiven of our sins by God when we ask him for forgiveness. A murderer who does not ask for forgiveness, although "saved", will surely go to hell.
Some sects have their believers follow doctrine that says that after you are saved, you are already forgiven for anything you might do. They can cheat on their spouses and never have to ask God's forgiveness, for they surely are going to heaven, anyway.
The Bible states those who do so and teach others to do so will be the least in the Kingdom on Heaven.
19 So if you break the smallest commandment and teach others to do the same, you will be the least in the Kingdom of Heaven. But anyone who obeys God’s laws and teaches them will be great in the Kingdom of Heaven.
I would not want to teach anyone to sin. Sin is harmfull to the spiritual and physical being.