Is Salaat valid in a church, behind an interfaither, Salafis and Barelwis?

Answer

Salaat is not permissible in churches. Salaat behind Barelwis is valid. However, if there is a non-Barelwi Musjid nearby, one should not perform behind the bid'ati. If the Salafi imaam is wearing socks, the Salaat will not be valid because Salafis make masah on ordinary socks. If one is caught up in such a situation, the Salaat should be repeated. Salaat behind a man who believes in interfaith is not valid. An interfaither is a murtad.