Tell me why any so-called religion that advocates this should be allowed period.
Sex with slaves?
You're okay with keeping Islamic "religion" advocated slaves?
3-1. Bill of rights.
All men are, by nature, equally free and independent, and have certain inherent rights, of which, when they enter into a state of society, they cannot, by any compact, deprive or divest their posterity, namely: The enjoyment of life and liberty, with the means of acquiring and possessing property, and of pursuing and obtaining happiness and safety. ...
3-11. ... Political tests condemned.
Political tests, requiring persons, as a prerequisite to the enjoyment of their civil and political rights, to purge themselves by their own oaths, of past alleged offences, are repugnant to the principles of free government, and are cruel and oppressive. No religious or political test oath shall be required as a prerequisite or qualification to vote, serve as a juror, sue, plead, appeal, or pursue any profession or employment. Nor shall any person be deprived by law, of any right, or privilege, because of any act done prior to the passage of such law. ...