A set of subordinating conjunctions always triggers the subjunctive in the clause that follows, regardless of the verb involved: bien que and quoique (although), pour que and afin que (so that), avant que (before), à moins que (unless), and sans que (without), among others.
Bien qu'il pleuve, nous sortons (although it's raining, we're going out) and je pars avant qu'il arrive (I'm leaving before he arrives) both use the subjunctive purely because of the conjunction, not because of any doubt or wish being expressed. This is a useful shortcut: recognizing these conjunctions on sight tells you the subjunctive is coming next, without needing to analyze the meaning of the sentence at all.