>>215977421 (OP)
I remember looking into this a while ago. Israeli Jews are divided into four categories by religiousness: the ultra-orthodox (Haredim), the religious, the traditional (try to eat Kosher etc. but religion isn't a big part of their life) and the seculars. The seculars are the largest group making up almost half of the Jewish population. The Haredim are the fastest growing group, however, because they have a shitton of children.
The difference between the Ashkenazi and the Mizrahi in this regard is that the Ashkenazi dominate the two extreme groups (ultra-orthodox and secular) while the Mizrahi are more numerous in the two in-between groups.