And whatever has been changed because of heresies by people, does not make anything of Haram into Halal, because Halal is what God has made Halal, and Haram is the same thing which God has made Haram [1]. Therefore, nothing or no one can ever change God’s Halal into Haram and vice-versa.
[1] Nahjul Balaghah, Sermon 176.