Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

  

The litmus test of a Muslim is the following: Belief in the six tenets of faith including the Oneness  of Allah, angels, books, messengers, resurrection, and divine decree and the five pillars including testimony of Oneness of God and Messengership of the Prophet, peace be upon him, five daily prayers, charity, fasting and pilgrimage to the House. On top of these, one ought to declare as Halal what Allah has declared as Halal, and maintain as Haram what Allah has declared as Haram. If he accepts the above, she may marry him.

 

Almighty Allah knows best.