"As one such Muslim, I call on my like-minded coreligionists to join me in wearing the irja badge with pride — and revived knowledge. We lost this key theology more than a millennium ago, but we desperately need it today to both end our religious civil wars and to establish liberty for all. Aware that irja is its theological antidote, the Islamic State presents it as a lack of religious piety. It is, however, true piety combined with humility — the humility that comes from honoring God as the only judge of men."
Writes Mustafa Akyol in a NYT op-ed titled "A Medieval Antidote to ISIS."
Irja = postponing (a basis, as described in the article, for "tolerant, noncoercive, pluralistic Islam — an Islamic liberalism").
ISIS considers irja the most dangerous heresy.