The ONLY way you will not be deceived is by being the very elect and who is the very elect?
Those who are born again of the Spirit of God, receiving a new heart and being sealed by the Holy Spirit until the day of redemption.
Sounds easy enough, right?
This entails dying to your wants, desires and even needs. Spending your time predominantly with the LORD and at all times allowing His will to be done. Being forsaken and betrayed by loved ones, friends, and distant family as well as members in your own household. Rejoicing and counting it all joy when you are mocked, laughed at, possibly even beaten or killed for the LORDS Namesake.
In order to know the Will of God He has given us His Pure, Inerrant and Infallible Word. It is a road map of sorts, it is His autobiography of sorts, it is not a set of rules of do’s and dont’s it is a history book as well as a history book written in advance before it happens. It is the most necessary earthly tool we have in order to increase our faith and teach us the ways of the LORD.
If we study and read the Word of God then when false doctrine, doctrine of devils, and false prophets begin to spew their prophecy from their own heart you will recognize it immediately! Discernment comes by reading and knowing the Truth in the Word. The gift of discerning of spirits is a totally different thing.
Not everyone that says they are a Christian, is, not everyone that claims to believe, does, not everyone that says LORD, LORD will be given a warm welcome.
Know where you are at with your walk with Jesus Christ. Always examine your own self to make sure you are still in the faith.