And if someone was ever known as a brother or sister, and yet have plainly returned to open sin, then they were just dogs and pigs all along.
Since they teach that fellowship only is dependent on works, then they can never believe any known brother or sister to ever have been a dog and pig all along, but rather must remain a brother and sister, but only 'out of fellowship' with God.
In the OSAS kingdom, their god is still saving dogs and pigs, just not fellowshipping with them.
And yet, if we are not fellowshipping with Him in the light, then we are not being cleansed from sin in His blood. (1 John 1:5-7)
Once Saved by Faith Alone believes in being 'covered' by the blood of Jesus without being washed in His blood.
But only them washed in His blood will wear robes of white.
The problem children of OSAS have is, they want to believe in a salvation by faith alone, but then try to insert some sort of obedience to the faith in their 'churches'.
So that they are not a complete laughingstock.