I believe the LORD gave us the description of events to come, and of Beast persecutions, etc. to HELP believers hang on to their faith, while events around them were causing massive distress. He was telling them not to be surprised by those awful things. Those things will happen. And His description of those things helps us to know that He does see the future. He will be there for us - when we meet those future trials. When we actually SEE those things come to pass, we are assured that the END will also be as He described - victory!
Through His prophets He has also warned of deception - almost perfect deception, near the END of things. We don't have to perfectly understand the deception. We just need to understand God's LAW along with the grace offered ONLY through Jesus. If we understand those things, then we will recognize any message that does not match up.
If a Christ-like "messiah" shows up, who tells everyone that it does not matter which day they "rest" or come up to "worship him" , we will recognize that his message does not match. If he draws all the worship to himself, and does not direct the worship to the Father in Heaven, we will know that does not match up. IF he teaches that all religions are equally "good", we will know that does not match up. We just need to know the basics, and know them well.