What is the ruling on praying behind a Sufi?

The questioner : Praying behind the Sufis? And the imam was a Sufi; so what is your opinion?

The Shaykh : The imam is a Sufi?

The questioner : A Sufi.

The Shaykh : Do you believe he is a Muslim or a disbeliever?

The questioner : A Muslim.

The Shaykh : A Muslim; it is permissible to pray behind him.

The questioner : And the creed, O Shaykh?

The Shaykh : May Allah guide you. Either he is declared a disbeliever on account of his creed, or he is not. If he is a disbeliever, then it is not permissible.

The questioner : All right, Shaykh, another question, Shaykh; what is your opinion of one of the sisters who rejected me because I do not belong to the Muslim Brotherhood?

The Shaykh : There is no partisan affiliation in Islam.