First of all, best to scrap all that Satan's plan and sign of the beast nonsense talk. Satan doesn't exist and is just the famous boogeyman that Christianity needs to keep their members in line. The sign of the beast 666 is just part of Revelation which if you ever read it, it's just one big drug trip written by an ancient, superstitious man and shouldn't be taken seriously at all.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.