This is what God gave me today in his word:
They do not say in their hearts, ‘Let us fear the LORD our God, who gives the rain in its season, the autumn rain and the spring rain, and keeps for us the weeks appointed for the harvest.’ Your iniquities have turned these away, and your sins have kept good from you. For wicked men are found among my people; they lurk like fowlers lying in wait. They set a trap; they catch men. (Jeremiah 5:24-26)
This (the above verse), is the old covenant, the one that has passed away, just to let you know. What I find interesting though, is that even though the old covenant has passed away, we still have these people! Just look at Galatians 1 for proof:
6 I am astonished that you are so quickly deserting the one who called you to live in the grace of Christ and are turning to a different gospel— 7 which is really no gospel at all. Evidently some people are throwing you into confusion and are trying to pervert the gospel of Christ. (Galatians 1:6-7)
In way back then in Galatia there were men trying to pervert (the Gospel) and confuse (the people). And there are still people like that today. Which begs the question; how can we recognize and avoid such people who enjoy catching other people? — For that matter, sense we’re no longer under the old Law but under the new, why should we even bother trying to avoid these people? After all, Jesus will protect us, right?
11 For no one can lay any foundation other than the one already laid, which is Jesus Christ. 12 If anyone builds on this foundation using gold, silver, costly stones, wood, hay or straw, 13 their work will be shown for what it is, because the Day will bring it to light. It will be revealed with fire, and the fire will test the quality of each person’s work. (1 Corinthians 3:11-13)
Jesus does protect us, and he won’t let us be tempted beyond what we can bear (1 Corinthians 10:13), but people can try to lay another foundation. Though no one in the end can lay a foundation other than Jesus, they can both try to lay a new one (attempt to confuse the Gospel) and build on the one you already have (pervert the Gospel). However, “in the light of day”, it will all be blown to bits (to put it one way).
Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist. (2 John 1:7)
To answer the second question; you can easily tell if someone is a anti-Christ and/or a deceiver simply by what they say. Do they acknowledge Jesus Christ has come in the flesh, died, and risen again to save us? Or are they trying to confuse you with the reality of the Gospel? Depending on what they say, lean away, or listen. But whatever you do, do it to the Glory of God; listen with a Gospel tuned ear.
You are loved!