وَإِنَّ الدِّينَ لَوَاقِعٌ
And indeed, recompense will surely occur.
The discussion also considers how participial descriptions can refer to prospective situations and thereby depart from the expression most immediately expected. However, an active or passive participle does not universally mean a future event.
Time, establishedness and certainty are recovered from the context. The rhetorical question is why this grammatical portrayal is preferred for the particular event and what degree of certainty or force it implies.