Jesus said believers fall away. There is no such thing as OSAS. He that is faithful until death will receive a crown of life.
They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away. Luke 8:13
Jesus says point blank that believers can and do fall away. Case closed.
OSAS is a joke
And let the depravity begin!
The answer to that is easy
All forms of immorality. Just let your mind wonder. Name it claim it. You can do anything you want. And no harm will come to you. That's because OSAS says so. The bible does not say that. So OSAS cuts the bible out. So easy.
But if you want to take the New Testament in its entirety as truth then you must accept
The total depravity of man
Unconditional election
Limited atonement
Irresistible grace
Perseverance of the saints
What keeps people from the truth more than anything else is unconditional election. To bad for the losers.
Any other explanation of the New Testament taken as a whole is inadequate. Therefore the sign of false doctrine is that the false doctrine cannot address every thing in the New Testament. OSAS doctrine is so weak that it can only address a couple of chapters of the New Testament.
OSAS is a joke