This is the reason that Satan does everything he can to overthrow a person s faith. If the person loses his faith or casts off his faith, he is no longer standing. As a result, they will have damnation. Here is the answer. This verse is very clear.
People do cast off their first faith.
People do cast off their faith in Jesus Christ as their only hope. Those that do, shall have damnation. They had faith in Jesus Christ. They were saved. But now, they have damnation.