Ruling on teaching man-made laws
Question

                What is the ruling on teaching man-made laws? What is the ruling on taking a salary for that?.
Praise be to Allah.Teaching man-made laws 
      or studying them in order to explain their falseness and to distinguish 
      what is right from what is wrong, and to demonstrate the superiority of 
      Islamic sharee’ah and to show that it is complete and encompasses 
      everything that is in people’s interests with regard to their worship and 
      their interactions with one another is permissible, and may be obligatory 
      if circumstances call for it, in order to demonstrate what is true and 
      what is false and to explain that to the ummah and make them aware of that 
      so that they will adhere to their religion, and will not be deceived by 
      the specious arguments of the deviants and those who promote the rule of 
      man-made laws. It is permissible to take payment for this kind of work. 
But with regard to 
    teaching man-made laws because one likes them and wants to promote them, and 
    prefers them to Islamic laws, and opposes Islamic laws, this is a challenge 
    against Allaah and His Messenger, and is blatant kufr and a deviation from 
    the straight path. Taking payment for this is haraam and is evil upon evil. 
    We ask Allaah to keep us safe and sound and we seek refuge in Him from 
    misguidance. 

    And Allaah is the Source of strength. May Allaah send 
    blessings and peace upon our Prophet Muhammad and his family and 
    companions. 

    From Fataawa al-Lajnah al-Daa’imah, 23/497. 
See also question no.
    12874.