1) “According to X, this crisis first arose in the religious sphere, and then spread as to cover philosophy, the sciences and the pseudo-sciences.” <br/><br/>Is “spread as to cover” right? <br/><br/>2) “These theories purport to prove there is indubitable knowledge”. <br/><br/>Is it better to add “that” after prove? <br/><br/>3) “It is important to consider what he understands as ‘fideism’”. <br/><br/>Understand “as” or perhaps “by”? <br/><br/>4) “The evil demon hypothesis has a similar target as the dream argument.” <br/><br/>This doesn’t sound correct; maybe “has a target similar to that of the dream argument”? <br/><br/>Sextus