*Rapture theorists* don't rely on miracles to back up their teachings but rather Scripture.
Satan can masquerade as an angel of light and perform many wondrous works. The occurrence of something someone would call a miracle is no evidence that the person is from God.
Correct, Scripturally accurate teaching is.
The person I was replying to was comparing Rapture theorists introducing novel doctrine to Jesus and the apostles. If you want to claim the type of authority Jesus and the apostles had, then I insist you demonstrate the signs of that authority, which are miracles, otherwise I won’t even consider recognizing it.
Scripture doesn’t back up the notion of a rapture preceding the resurrection of the dead, so it’s no use appealing to that.