Actually, those who disbelieve the permanence of being truly born again and that their adoption is secure do, if they would look at one of their favorite arguments against ‘OSAS’*.
It has been discussed elsewhere:
*‘OSAS’ is not my term of preference, because it is so often used disparagingly against those who know their salvation is secure, and I think the arguments of those who use it are simplistic, as just demonstrated. But oh well.