He became Muslim then he did something that is nullifies Islam, out of ignorance
Question

                If a kaafir enters Islam then he does something that nullifies Islam because of ignorance, how should he be dealt with? Should he renew his Islam?.
Praise be to Allah.
    He should be dealt with in the way that is better, and he 
    should be told that this is something that nullifies Islam, but there is no 
    need for him to renew his Islam, because this contrary action that he did is 
    something that he was unaware of, and Allaah says (interpretation of the 
    meaning): 

    “And We never punish until We have sent a Messenger (to 
    give warning)”

    [al-Isra’ 17:15] 

    “And never would We destroy the towns unless the people 
    thereof are Zaalimoon (polytheists, wrongdoers, disbelievers in the Oneness 
    of Allaah, oppressors and tyrants)”

    [al-Qasas 28:59]. 

    The one who is ignorant is not a wrongdoer, because he did 
    not mean to sin, especially if he is new in Islam. End quote.