what you need for immigrants isn't a religious test. it's a constitutional test.
this test wouldn't just deal with learning the document. it would talk about the reasons for the constitutional structure.
why the law is man made. why secular democracy is preferred to theocracy and dictatorship models such as a caliphate. how multicultural societies permit no superior types of religion. why racism is not permissible, for instance against jews. how we think about a person's privacy including private sexual choices. which forms of punishment are allowed and which forms are disqualified eg no cutting off of hands, whipping, crucifiction. what the rule of law is and why it makes sense and why religious legal systems are unworkable. what freedom of speech means and why being critical and/or offensive is part of what it is. how free speech and non-violent protest offer a means to reply. what freedom of religion means and why a buddhist, a jew or an atheist has the same rights as a christian or a moslem. how love and marriage is a personal choice. how killing for reasons of honour makes you repellant and a criminal. why tax is raised and why it isn't applied based on religion. etc.
make classes available to teach this stuff to potential immigrants. you have to pass the class.
then each immigrant has to take a constitutional test in the form of an interview before being admitted.
seems reasonable to me.
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