Now, why should I answer the question as if the condition existed, when it doesn't?
It is only because you reject the Tribulation (Jacobs trouble-Jer.30:7) that you think this is relevent.
If that many people were in fact Israelites, they would still be killed (2/3-Zech.13:9) and would be on the verge of annihilation when the Lord returns to save them. (Zech.8:13)