Regarding Matthew chapter 24, verses 1-4:
The first thing Jesus told his disciples to be aware of, concerning events to come before his return, was to beware that no one deceive them. Some people will actually say they are Jesus and try to mislead people. There are also the more common deceptions of people who profess to be Christians or church leaders that teach doctrines that are not found in the Bible and distort the scriptures and the nature of Jesus and God.

The scripture says that many will be decieved.  You can only be decieved if you put other beliefs first before the scriptures of the Bible. Supernatural events or experiences must not be placed as more important than the word of God. We walk by faith not by sight. The more familiar you are with the Bible, the harder it will be to be decieved. It is often said that the more familiar one is with a real dollar bill the easier it is to spot a counterfit one.