Everything is often used in a context where it is a finite amount or collection. But in an absolute context it is "without any exception". And in an infinite reality that means quite something different.
Even a bright blue orange would in that case be part of everything, albeit a concept that is considered a fantasy or fiction by most humans. The devil is a fiction to many people also, but the captain of the USCSS Covenant in the latest Alien movie does not consider him so. Instead, he claims to have met Satan in his youth, and he forces the android to tell him the truth. Little is he to know, that he will son meet Satan's spawn in the form of a Face hugger, an animal far more malignant and terrifying than the devil himself...