Is it permissible to cooperate with a man of Ash'ari creed for the sake of calling people to Allah, if this cooperation does not lead to harms?

The questioner : This is a theoretical question. It asks: Is it permissible to cooperate with a man of Ash'ari creed in the field of calling people to Allah, on the grounds that this disagreement in creed does not result in harms, but rather that not cooperating with him may lead to the division of the efforts of the Muslims?

The Shaykh : If cooperating with such a man does not lead the one cooperating with him to be lax in his creed, then that is permissible without a doubt. In fact, I believe that it is among the religious interests of the strong believer in faith to cooperate with other Muslims who have deviated from the Salafi creed due to some of the old or new causes. It is more fitting for this Salafi believer to cooperate with these people, because he will find the appropriate opportunity to convey the Salafi call to them. And what happens, and we know this by experience, is that the position of those who differ from him toward this righteous Salafi believer will be one of two things: either they will respond to his call and incline toward accepting the Salafi school and deviating from their later school, and this has happened often; or they will reject him and his school and refuse to deal with him, in which case the matter returns to them and not to him.