Question 4: What is the ruling if a Christian woman whose husband is Christian converts to Islaam and wants to marry a Muslim man? What is the Shar`ee (Islaamic legal) ruling on this?
Answer: If a woman married to a non-Muslim man converts to Islaam, she is prohibited to be his wife and they should be separated. However, the elapse of her `Iddah (waiting period) has to be taken into consideration. If the `Iddah is over before he converts to Islaam, a minor irrevocable divorce will take place as Allaah (Exalted be He) said... read more here.