I know what you mean, but I would amend that to say it WILL "look like" Christianity, in the sense of outward superficial facade. It will be a dead ringer.
When the devil mugs you, the first thing he takes is your I.D.
When the devil takes a city, he doesn't change the flag.
You’re right. It will be “bootleg” copy of Christianity. It will fool “even the elect”. I don’t know whether to be frightened or excited, but it sure looks very much like John’s prophesies right now.