[1] Endogamous religious cultures may have certain opposition to interfaith marriage and ethnic assimilation, and may assert prohibitions against the conversion ("marrying out") of one their own claimed adherents.
Marriage to unbaptized persons, meaning all non-Christians and members of some Christian denominations (such as Unitarians or Mormons), was forbidden.
The Iglesia ni Cristo, a non-trinitarian church that is the largest indigenous Christian denomination in the Philippines, requires non-adherents marrying members to convert to the religion prior to the wedding.
Culturally, it is accepted that marriage between a follower of Islam (Muslim) and a Christian or Jew does not require conversion.
Although, there are no official conversion rules, Islamic marriage laws are generally guided by traditional interpretations.
On the other hand, if a Jew desires to leave Judaism, they are regarded as apostates or "assimilators" into a non-Jewish religion or culture.
have controversially referred to Jewish intermarriage as being a "Silent Holocaust," particularly in 20th-21st century America where as many as 47% of American Jews have intermarried with non-Jews in past two decades.[when?]