The 1949 World Almanac states 89,993,458 fewer Christians than in 1934 but 438,638 more Jews.... Why is that?

1934 World Almanac
Worldwide Populations

15,315,000 Jews

682,400,000 Christians


1949 World Almanac
Worldwide Populations

15,753,638 Jews
(up 438,638 on 1934)

592,406,542 Christians
(down 89,993,458 on 1934)


WW2 explain 90 MILLION less xians, but how come the Jews increased in number during the the bloodiest war this planet has yet seen?