A character who has taken a class-specific multiclass feat counts as a member of that class for the purpose of meeting prerequisites for taking other feats and qualifying for paragon paths. For example, a character who takes Initiate of the Faith counts as a cleric for the purpose of selecting feats that have cleric as a prerequisite. These feats can qualify you for other feats; for example, a warlock who takes Sneak of Shadows can use the rogue’s Sneak Attack class feature, which means that he meets the prerequisite for the Backstabber feat