I remember reading years ago that when there gets to be a lot of people, people stop believing in God.
Then the people get wiped out, When there are fewer people they return to God.
This is a cycle.
But more specifically to your point. The bible has hard, difficult criticall times covered in the new testament. When ever times get tough they will bring the 24 chapter of Matthew up. And fill up all the seats.
So I see 2 possiblities, Thats the way God wants it.
Or the Jew's are great con men.