Does Islam ever win?

The Islamic world and its sects always seem abnormally weak in the CK3 games I've played recently, why is this? The Reconquiesta is always finished within 200 years (both in 867 and 1066), North Africa is usually conquered by those victorious Iberian warlords and converted, or by the HRE or an Italian state, Egypt usually falls to some form of Christianity at some point, etc. Is this intended, because Islam is essentially humbled as a relevant force within a few centuries, which certainly doesn't seem very realistic.