The Great Apostasy Part 1: Definition and Biblical Evidence-There is NO OSAS

From ICHTHYS.COM, Coming Tribulation series part 3a The Great Apostasy

And [the dragon's] (i.e., the devil's) tail swept away a third of the stars of heaven (i.e., both fallen angels and fallen believers) and threw them to the earth (i.e., their rebellion or apostasy and consequent association with them in their fall).
Revelation 12:4a

And [the little horn] (i.e., antichrist as a type and representative of the devil) magnified himself against the host of heaven (i.e., the family of God, men and angels both), and he cast down to the earth some of the host (i.e., antichrist seducing believers into apostasy) and some of the stars (i.e., Satan having seduced angels into rebellion) and he trampled them underfoot (i.e., their rebellion or apostasy in association with evil leading to their subsequent destruction; cf. Dan.7:7; 7:19; Rev.11:2).
Daniel 8:10