I was once told that in Roman times, it was illegal to disown an adopted child. However, a person could disown their natural children. Just not their adopted children.Mark Allison wrote:All Christians are adopted children. You don’t get “unadopted” just because you sin.
I have heard some Christians argue that since the New Testament was written during the time of Roman Law that the reason that the New Testament describes born again believers as being adopted into God's family has to do with this idea of the unconditional childship of the adopted person.