Scorpion-tailed locusts

Locusts and scorpions are also mentioned in Revelation.  The attack of the locusts is similar to the plague of locusts in ancient Egypt.  These locusts had the poison of scorpions.  Locusts and scorpions have been also applied by some commentators to the armies of Mohammad in their wars of conquest.  Authority was given to them as a scourge against apostate Christianity.  However, there were no Muslims at the time of Christ, so that this anti-Muslim interpretation does not hold up.  What do you know about Muslims?