https://forward.com/life/faith/404841/the-other-intermarriage-crisis/
I found this to be by far the most interesting paragraph
One would think that some of of the primary barriers to such “interfaith” marriages would be kashruth and the laws of family purity, which stipulate that couples refrain from relations two weeks out of the month, only resuming sexual activity after the wife immerses herself in the mikvah. However, it appears that many of the couples are more concerned with Shabbat restrictions, given the social nature of the day in secular Israeli society, and with questions of how to educate their children.
Read more:
https://forward.com/life/faith/404841/the-other-intermarriage-crisis/