Salah which is performed behind

Q 1: Many Imams of our Masjids (mosques) follow the Tijany Tariqah (a Sufi order). The students said that it is impermissible to follow an Imam who adheres to this order. Is this correct? (Part No. 6; Page No. 291

A: Every Muslim is obliged to follow the Qur'an and Sunnah and to imitate the Messenger (peace be upon him), the scholars who follow his Sunnah, and those who apply the teachings of the Qur'an and Sunnah. You are prohibited to follow and imitate heretics who follow Sufi orders. Furthermore, it is impermissible to offer Salah behind them if they commit Shirk, in deeds and words, such as supplicating or slaughtering animals for the sake of anyone other than Allah.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.